Home / 138,713.45-191,370.10-80,560.29

Finding the Fourth Proportional to 138,713.45, 191,370.10 and 80,560.29

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Solution

The fourth proportional to 138,713.45, 191,370.10 and 80,560.29 is: 111,141.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,713.45 : 191,370.10 = 80,560.29 : x
  2. Step 2: Convert to fraction form
    138,713.45/191,370.10 = 80,560.29/x
  3. Step 3: Cross multiply
    138,713.45x = 191,370.10 × 80,560.29
  4. Step 4: Simplify right side
    138,713.45x = 15,416,830,174.20
  5. Step 5: Solve for x
    x = 15,416,830,174.20/138,713.45
  6. Step 6: Final answer
    x = 111,141.57

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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.