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Finding the Fourth Proportional to 78,493.78, 117,740.67 and 39,127.78

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Solution

The fourth proportional to 78,493.78, 117,740.67 and 39,127.78 is: 58,691.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,493.78 : 117,740.67 = 39,127.78 : x
  2. Step 2: Convert to fraction form
    78,493.78/117,740.67 = 39,127.78/x
  3. Step 3: Cross multiply
    78,493.78x = 117,740.67 × 39,127.78
  4. Step 4: Simplify right side
    78,493.78x = 4,606,930,248.47
  5. Step 5: Solve for x
    x = 4,606,930,248.47/78,493.78
  6. Step 6: Final answer
    x = 58,691.66

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1.5x scale

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.