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Finding the Fourth Proportional to 457,720.40, 686,580.60 and 408,731.60

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Solution

The fourth proportional to 457,720.40, 686,580.60 and 408,731.60 is: 613,097.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    457,720.40 : 686,580.60 = 408,731.60 : x
  2. Step 2: Convert to fraction form
    457,720.40/686,580.60 = 408,731.60/x
  3. Step 3: Cross multiply
    457,720.40x = 686,580.60 × 408,731.60
  4. Step 4: Simplify right side
    457,720.40x = 280,627,187,166.96
  5. Step 5: Solve for x
    x = 280,627,187,166.96/457,720.40
  6. Step 6: Final answer
    x = 613,097.40

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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.