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Finding the Fourth Proportional to 87,376.60, 131,064.90 and 85,918.60

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Solution

The fourth proportional to 87,376.60, 131,064.90 and 85,918.60 is: 128,877.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,376.60 : 131,064.90 = 85,918.60 : x
  2. Step 2: Convert to fraction form
    87,376.60/131,064.90 = 85,918.60/x
  3. Step 3: Cross multiply
    87,376.60x = 131,064.90 × 85,918.60
  4. Step 4: Simplify right side
    87,376.60x = 11,260,912,717.14
  5. Step 5: Solve for x
    x = 11,260,912,717.14/87,376.60
  6. Step 6: Final answer
    x = 128,877.90

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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.