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Finding the Fourth Proportional to 138,508.80, 191,142.40 and 78,892.80

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Solution

The fourth proportional to 138,508.80, 191,142.40 and 78,892.80 is: 108,872.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,508.80 : 191,142.40 = 78,892.80 : x
  2. Step 2: Convert to fraction form
    138,508.80/191,142.40 = 78,892.80/x
  3. Step 3: Cross multiply
    138,508.80x = 191,142.40 × 78,892.80
  4. Step 4: Simplify right side
    138,508.80x = 15,079,759,134.72
  5. Step 5: Solve for x
    x = 15,079,759,134.72/138,508.80
  6. Step 6: Final answer
    x = 108,872.21

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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.