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Finding the Fourth Proportional to 661,604,695.17, 912,337,738.42 and 438,508,912.65

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Solution

The fourth proportional to 661,604,695.17, 912,337,738.42 and 438,508,912.65 is: 604,693,758.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,604,695.17 : 912,337,738.42 = 438,508,912.65 : x
  2. Step 2: Convert to fraction form
    661,604,695.17/912,337,738.42 = 438,508,912.65/x
  3. Step 3: Cross multiply
    661,604,695.17x = 912,337,738.42 × 438,508,912.65
  4. Step 4: Simplify right side
    661,604,695.17x = 400,068,229,644,114,304
  5. Step 5: Solve for x
    x = 400,068,229,644,114,304/661,604,695.17
  6. Step 6: Final answer
    x = 604,693,758.32

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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.