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Finding the Fourth Proportional to 257,391.90, 386,139.42 and 88,918.38

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Solution

The fourth proportional to 257,391.90, 386,139.42 and 88,918.38 is: 133,395.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    257,391.90 : 386,139.42 = 88,918.38 : x
  2. Step 2: Convert to fraction form
    257,391.90/386,139.42 = 88,918.38/x
  3. Step 3: Cross multiply
    257,391.90x = 386,139.42 × 88,918.38
  4. Step 4: Simplify right side
    257,391.90x = 34,334,891,680.54
  5. Step 5: Solve for x
    x = 34,334,891,680.54/257,391.90
  6. Step 6: Final answer
    x = 133,395.39

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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.