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Finding the Fourth Proportional to 86,287.70, 129,435.60 and 27,125.30

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Solution

The fourth proportional to 86,287.70, 129,435.60 and 27,125.30 is: 40,689.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,287.70 : 129,435.60 = 27,125.30 : x
  2. Step 2: Convert to fraction form
    86,287.70/129,435.60 = 27,125.30/x
  3. Step 3: Cross multiply
    86,287.70x = 129,435.60 × 27,125.30
  4. Step 4: Simplify right side
    86,287.70x = 3,510,979,480.68
  5. Step 5: Solve for x
    x = 3,510,979,480.68/86,287.70
  6. Step 6: Final answer
    x = 40,689.22

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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.