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Finding the Fourth Proportional to 87,288.40, 130,932.60 and 81,456.40

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Solution

The fourth proportional to 87,288.40, 130,932.60 and 81,456.40 is: 122,184.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,288.40 : 130,932.60 = 81,456.40 : x
  2. Step 2: Convert to fraction form
    87,288.40/130,932.60 = 81,456.40/x
  3. Step 3: Cross multiply
    87,288.40x = 130,932.60 × 81,456.40
  4. Step 4: Simplify right side
    87,288.40x = 10,665,298,238.64
  5. Step 5: Solve for x
    x = 10,665,298,238.64/87,288.40
  6. Step 6: Final answer
    x = 122,184.60

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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.