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Finding the Fourth Proportional to 87,661.30, 131,491.95 and 80,902.90

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Solution

The fourth proportional to 87,661.30, 131,491.95 and 80,902.90 is: 121,354.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,661.30 : 131,491.95 = 80,902.90 : x
  2. Step 2: Convert to fraction form
    87,661.30/131,491.95 = 80,902.90/x
  3. Step 3: Cross multiply
    87,661.30x = 131,491.95 × 80,902.90
  4. Step 4: Simplify right side
    87,661.30x = 10,638,080,081.66
  5. Step 5: Solve for x
    x = 10,638,080,081.66/87,661.30
  6. Step 6: Final answer
    x = 121,354.35

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1.5x scale

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.