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Finding the Fourth Proportional to 87,266.10, 130,899.15 and 81,390.90

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Solution

The fourth proportional to 87,266.10, 130,899.15 and 81,390.90 is: 122,086.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,266.10 : 130,899.15 = 81,390.90 : x
  2. Step 2: Convert to fraction form
    87,266.10/130,899.15 = 81,390.90/x
  3. Step 3: Cross multiply
    87,266.10x = 130,899.15 × 81,390.90
  4. Step 4: Simplify right side
    87,266.10x = 10,653,999,627.74
  5. Step 5: Solve for x
    x = 10,653,999,627.74/87,266.10
  6. Step 6: Final answer
    x = 122,086.35

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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.