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Finding the Fourth Proportional to 663,308.28, 915,513.12 and 421,543.68

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Solution

The fourth proportional to 663,308.28, 915,513.12 and 421,543.68 is: 581,824.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,308.28 : 915,513.12 = 421,543.68 : x
  2. Step 2: Convert to fraction form
    663,308.28/915,513.12 = 421,543.68/x
  3. Step 3: Cross multiply
    663,308.28x = 915,513.12 × 421,543.68
  4. Step 4: Simplify right side
    663,308.28x = 385,928,769,693.08
  5. Step 5: Solve for x
    x = 385,928,769,693.08/663,308.28
  6. Step 6: Final answer
    x = 581,824.14

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.