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Finding the Fourth Proportional to 645,339.60, 968,009.40 and 620,845.20

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Solution

The fourth proportional to 645,339.60, 968,009.40 and 620,845.20 is: 931,267.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,339.60 : 968,009.40 = 620,845.20 : x
  2. Step 2: Convert to fraction form
    645,339.60/968,009.40 = 620,845.20/x
  3. Step 3: Cross multiply
    645,339.60x = 968,009.40 × 620,845.20
  4. Step 4: Simplify right side
    645,339.60x = 600,983,989,544.88
  5. Step 5: Solve for x
    x = 600,983,989,544.88/645,339.60
  6. Step 6: Final answer
    x = 931,267.80

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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.