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Finding the Fourth Proportional to 123,301.71, 170,138.11 and 74,878.45

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Solution

The fourth proportional to 123,301.71, 170,138.11 and 74,878.45 is: 103,321.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,301.71 : 170,138.11 = 74,878.45 : x
  2. Step 2: Convert to fraction form
    123,301.71/170,138.11 = 74,878.45/x
  3. Step 3: Cross multiply
    123,301.71x = 170,138.11 × 74,878.45
  4. Step 4: Simplify right side
    123,301.71x = 12,739,677,962.73
  5. Step 5: Solve for x
    x = 12,739,677,962.73/123,301.71
  6. Step 6: Final answer
    x = 103,321.18

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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.