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Finding the Fourth Proportional to 138,068.78, 207,103.67 and 42,006.93

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Solution

The fourth proportional to 138,068.78, 207,103.67 and 42,006.93 is: 63,010.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,068.78 : 207,103.67 = 42,006.93 : x
  2. Step 2: Convert to fraction form
    138,068.78/207,103.67 = 42,006.93/x
  3. Step 3: Cross multiply
    138,068.78x = 207,103.67 × 42,006.93
  4. Step 4: Simplify right side
    138,068.78x = 8,699,789,368.43
  5. Step 5: Solve for x
    x = 8,699,789,368.43/138,068.78
  6. Step 6: Final answer
    x = 63,010.55

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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.