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Finding the Fourth Proportional to 87,871.40, 131,816.70 and 85,106.60

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Solution

The fourth proportional to 87,871.40, 131,816.70 and 85,106.60 is: 127,669.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,871.40 : 131,816.70 = 85,106.60 : x
  2. Step 2: Convert to fraction form
    87,871.40/131,816.70 = 85,106.60/x
  3. Step 3: Cross multiply
    87,871.40x = 131,816.70 × 85,106.60
  4. Step 4: Simplify right side
    87,871.40x = 11,218,471,160.22
  5. Step 5: Solve for x
    x = 11,218,471,160.22/87,871.40
  6. Step 6: Final answer
    x = 127,669.20

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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.