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Finding the Fourth Proportional to 128,515.60, 192,773.40 and 86,525.20

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Solution

The fourth proportional to 128,515.60, 192,773.40 and 86,525.20 is: 129,787.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,515.60 : 192,773.40 = 86,525.20 : x
  2. Step 2: Convert to fraction form
    128,515.60/192,773.40 = 86,525.20/x
  3. Step 3: Cross multiply
    128,515.60x = 192,773.40 × 86,525.20
  4. Step 4: Simplify right side
    128,515.60x = 16,679,756,989.68
  5. Step 5: Solve for x
    x = 16,679,756,989.68/128,515.60
  6. Step 6: Final answer
    x = 129,787.80

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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.