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Finding the Fourth Proportional to 128,502.60, 192,753.90 and 86,512.20

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Solution

The fourth proportional to 128,502.60, 192,753.90 and 86,512.20 is: 129,768.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,502.60 : 192,753.90 = 86,512.20 : x
  2. Step 2: Convert to fraction form
    128,502.60/192,753.90 = 86,512.20/x
  3. Step 3: Cross multiply
    128,502.60x = 192,753.90 × 86,512.20
  4. Step 4: Simplify right side
    128,502.60x = 16,675,563,947.58
  5. Step 5: Solve for x
    x = 16,675,563,947.58/128,502.60
  6. Step 6: Final answer
    x = 129,768.30

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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.