Home / 645,816.40-966,420.60-409,272.40

Finding the Fourth Proportional to 645,816.40, 966,420.60 and 409,272.40

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Solution

The fourth proportional to 645,816.40, 966,420.60 and 409,272.40 is: 612,448.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,816.40 : 966,420.60 = 409,272.40 : x
  2. Step 2: Convert to fraction form
    645,816.40/966,420.60 = 409,272.40/x
  3. Step 3: Cross multiply
    645,816.40x = 966,420.60 × 409,272.40
  4. Step 4: Simplify right side
    645,816.40x = 395,529,278,371.44
  5. Step 5: Solve for x
    x = 395,529,278,371.44/645,816.40
  6. Step 6: Final answer
    x = 612,448.49

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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.