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Finding the Fourth Proportional to 645,902.40, 968,853.60 and 505,780.80

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Solution

The fourth proportional to 645,902.40, 968,853.60 and 505,780.80 is: 758,671.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,902.40 : 968,853.60 = 505,780.80 : x
  2. Step 2: Convert to fraction form
    645,902.40/968,853.60 = 505,780.80/x
  3. Step 3: Cross multiply
    645,902.40x = 968,853.60 × 505,780.80
  4. Step 4: Simplify right side
    645,902.40x = 490,027,548,890.88
  5. Step 5: Solve for x
    x = 490,027,548,890.88/645,902.40
  6. Step 6: Final answer
    x = 758,671.20

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.