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Finding the Fourth Proportional to 128,114.10, 192,171.15 and 86,123.70

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Solution

The fourth proportional to 128,114.10, 192,171.15 and 86,123.70 is: 129,185.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,114.10 : 192,171.15 = 86,123.70 : x
  2. Step 2: Convert to fraction form
    128,114.10/192,171.15 = 86,123.70/x
  3. Step 3: Cross multiply
    128,114.10x = 192,171.15 × 86,123.70
  4. Step 4: Simplify right side
    128,114.10x = 16,550,490,471.26
  5. Step 5: Solve for x
    x = 16,550,490,471.26/128,114.10
  6. Step 6: Final answer
    x = 129,185.55

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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.