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Finding the Fourth Proportional to 613,508.40, 921,604.32 and 437,148.72

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Solution

The fourth proportional to 613,508.40, 921,604.32 and 437,148.72 is: 656,679.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    613,508.40 : 921,604.32 = 437,148.72 : x
  2. Step 2: Convert to fraction form
    613,508.40/921,604.32 = 437,148.72/x
  3. Step 3: Cross multiply
    613,508.40x = 921,604.32 × 437,148.72
  4. Step 4: Simplify right side
    613,508.40x = 402,878,148,834.47
  5. Step 5: Solve for x
    x = 402,878,148,834.47/613,508.40
  6. Step 6: Final answer
    x = 656,679.11

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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.