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Finding the Fourth Proportional to 113,129.20, 169,693.80 and 71,138.80

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Solution

The fourth proportional to 113,129.20, 169,693.80 and 71,138.80 is: 106,708.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    113,129.20 : 169,693.80 = 71,138.80 : x
  2. Step 2: Convert to fraction form
    113,129.20/169,693.80 = 71,138.80/x
  3. Step 3: Cross multiply
    113,129.20x = 169,693.80 × 71,138.80
  4. Step 4: Simplify right side
    113,129.20x = 12,071,813,299.44
  5. Step 5: Solve for x
    x = 12,071,813,299.44/113,129.20
  6. Step 6: Final answer
    x = 106,708.20

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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.