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Finding the Fourth Proportional to 122,640.30, 169,213.95 and 71,624.07

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Solution

The fourth proportional to 122,640.30, 169,213.95 and 71,624.07 is: 98,823.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,640.30 : 169,213.95 = 71,624.07 : x
  2. Step 2: Convert to fraction form
    122,640.30/169,213.95 = 71,624.07/x
  3. Step 3: Cross multiply
    122,640.30x = 169,213.95 × 71,624.07
  4. Step 4: Simplify right side
    122,640.30x = 12,119,791,799.78
  5. Step 5: Solve for x
    x = 12,119,791,799.78/122,640.30
  6. Step 6: Final answer
    x = 98,823.89

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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.