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Finding the Fourth Proportional to 121,885.70, 168,233.56 and 74,172.65

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Solution

The fourth proportional to 121,885.70, 168,233.56 and 74,172.65 is: 102,377.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,885.70 : 168,233.56 = 74,172.65 : x
  2. Step 2: Convert to fraction form
    121,885.70/168,233.56 = 74,172.65/x
  3. Step 3: Cross multiply
    121,885.70x = 168,233.56 × 74,172.65
  4. Step 4: Simplify right side
    121,885.70x = 12,478,327,937.53
  5. Step 5: Solve for x
    x = 12,478,327,937.53/121,885.70
  6. Step 6: Final answer
    x = 102,377.30

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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.