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Finding the Fourth Proportional to 122,987.76, 169,723.36 and 71,991.28

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Solution

The fourth proportional to 122,987.76, 169,723.36 and 71,991.28 is: 99,348.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,987.76 : 169,723.36 = 71,991.28 : x
  2. Step 2: Convert to fraction form
    122,987.76/169,723.36 = 71,991.28/x
  3. Step 3: Cross multiply
    122,987.76x = 169,723.36 × 71,991.28
  4. Step 4: Simplify right side
    122,987.76x = 12,218,601,932.30
  5. Step 5: Solve for x
    x = 12,218,601,932.30/122,987.76
  6. Step 6: Final answer
    x = 99,348.11

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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.