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Finding the Fourth Proportional to 121,680.70, 182,521.05 and 86,251.30

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Solution

The fourth proportional to 121,680.70, 182,521.05 and 86,251.30 is: 129,376.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,680.70 : 182,521.05 = 86,251.30 : x
  2. Step 2: Convert to fraction form
    121,680.70/182,521.05 = 86,251.30/x
  3. Step 3: Cross multiply
    121,680.70x = 182,521.05 × 86,251.30
  4. Step 4: Simplify right side
    121,680.70x = 15,742,677,839.87
  5. Step 5: Solve for x
    x = 15,742,677,839.87/121,680.70
  6. Step 6: Final answer
    x = 129,376.95

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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.