Home / 138,451.37-191,126.68-81,082.72

Finding the Fourth Proportional to 138,451.37, 191,126.68 and 81,082.72

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Solution

The fourth proportional to 138,451.37, 191,126.68 and 81,082.72 is: 111,931.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,451.37 : 191,126.68 = 81,082.72 : x
  2. Step 2: Convert to fraction form
    138,451.37/191,126.68 = 81,082.72/x
  3. Step 3: Cross multiply
    138,451.37x = 191,126.68 × 81,082.72
  4. Step 4: Simplify right side
    138,451.37x = 15,497,070,398.45
  5. Step 5: Solve for x
    x = 15,497,070,398.45/138,451.37
  6. Step 6: Final answer
    x = 111,931.50

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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.