Home / 138,672.18-191,353.59-80,508.78

Finding the Fourth Proportional to 138,672.18, 191,353.59 and 80,508.78

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Solution

The fourth proportional to 138,672.18, 191,353.59 and 80,508.78 is: 111,093.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,672.18 : 191,353.59 = 80,508.78 : x
  2. Step 2: Convert to fraction form
    138,672.18/191,353.59 = 80,508.78/x
  3. Step 3: Cross multiply
    138,672.18x = 191,353.59 × 80,508.78
  4. Step 4: Simplify right side
    138,672.18x = 15,405,644,079.52
  5. Step 5: Solve for x
    x = 15,405,644,079.52/138,672.18
  6. Step 6: Final answer
    x = 111,093.98

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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.