Home / 138,512.13-191,148.44-78,082.80

Finding the Fourth Proportional to 138,512.13, 191,148.44 and 78,082.80

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Solution

The fourth proportional to 138,512.13, 191,148.44 and 78,082.80 is: 107,755.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,512.13 : 191,148.44 = 78,082.80 : x
  2. Step 2: Convert to fraction form
    138,512.13/191,148.44 = 78,082.80/x
  3. Step 3: Cross multiply
    138,512.13x = 191,148.44 × 78,082.80
  4. Step 4: Simplify right side
    138,512.13x = 14,925,405,020.42
  5. Step 5: Solve for x
    x = 14,925,405,020.42/138,512.13
  6. Step 6: Final answer
    x = 107,755.22

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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.