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Finding the Fourth Proportional to 86,809.60, 129,868.80 and 75,251.20

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Solution

The fourth proportional to 86,809.60, 129,868.80 and 75,251.20 is: 112,577.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,809.60 : 129,868.80 = 75,251.20 : x
  2. Step 2: Convert to fraction form
    86,809.60/129,868.80 = 75,251.20/x
  3. Step 3: Cross multiply
    86,809.60x = 129,868.80 × 75,251.20
  4. Step 4: Simplify right side
    86,809.60x = 9,772,783,042.56
  5. Step 5: Solve for x
    x = 9,772,783,042.56/86,809.60
  6. Step 6: Final answer
    x = 112,577.22

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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.