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Finding the Fourth Proportional to 128,381.31, 177,174.41 and 71,793.09

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Solution

The fourth proportional to 128,381.31, 177,174.41 and 71,793.09 is: 99,079.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,381.31 : 177,174.41 = 71,793.09 : x
  2. Step 2: Convert to fraction form
    128,381.31/177,174.41 = 71,793.09/x
  3. Step 3: Cross multiply
    128,381.31x = 177,174.41 × 71,793.09
  4. Step 4: Simplify right side
    128,381.31x = 12,719,898,003.86
  5. Step 5: Solve for x
    x = 12,719,898,003.86/128,381.31
  6. Step 6: Final answer
    x = 99,079.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.