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Finding the Fourth Proportional to 87,959.20, 131,690.40 and 68,465.20

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Solution

The fourth proportional to 87,959.20, 131,690.40 and 68,465.20 is: 102,504.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,959.20 : 131,690.40 = 68,465.20 : x
  2. Step 2: Convert to fraction form
    87,959.20/131,690.40 = 68,465.20/x
  3. Step 3: Cross multiply
    87,959.20x = 131,690.40 × 68,465.20
  4. Step 4: Simplify right side
    87,959.20x = 9,016,209,574.08
  5. Step 5: Solve for x
    x = 9,016,209,574.08/87,959.20
  6. Step 6: Final answer
    x = 102,504.45

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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.