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Finding the Fourth Proportional to 86,687.60, 130,031.40 and 81,438.80

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Solution

The fourth proportional to 86,687.60, 130,031.40 and 81,438.80 is: 122,158.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,687.60 : 130,031.40 = 81,438.80 : x
  2. Step 2: Convert to fraction form
    86,687.60/130,031.40 = 81,438.80/x
  3. Step 3: Cross multiply
    86,687.60x = 130,031.40 × 81,438.80
  4. Step 4: Simplify right side
    86,687.60x = 10,589,601,178.32
  5. Step 5: Solve for x
    x = 10,589,601,178.32/86,687.60
  6. Step 6: Final answer
    x = 122,158.20

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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.