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Finding the Fourth Proportional to 135,342.50, 186,767.97 and 74,915.78

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Solution

The fourth proportional to 135,342.50, 186,767.97 and 74,915.78 is: 103,381.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,342.50 : 186,767.97 = 74,915.78 : x
  2. Step 2: Convert to fraction form
    135,342.50/186,767.97 = 74,915.78/x
  3. Step 3: Cross multiply
    135,342.50x = 186,767.97 × 74,915.78
  4. Step 4: Simplify right side
    135,342.50x = 13,991,868,151.57
  5. Step 5: Solve for x
    x = 13,991,868,151.57/135,342.50
  6. Step 6: Final answer
    x = 103,381.19

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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.