Home / 138,747.42-191,472.09-78,320.61

Finding the Fourth Proportional to 138,747.42, 191,472.09 and 78,320.61

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Solution

The fourth proportional to 138,747.42, 191,472.09 and 78,320.61 is: 108,082.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,747.42 : 191,472.09 = 78,320.61 : x
  2. Step 2: Convert to fraction form
    138,747.42/191,472.09 = 78,320.61/x
  3. Step 3: Cross multiply
    138,747.42x = 191,472.09 × 78,320.61
  4. Step 4: Simplify right side
    138,747.42x = 14,996,210,886.77
  5. Step 5: Solve for x
    x = 14,996,210,886.77/138,747.42
  6. Step 6: Final answer
    x = 108,082.81

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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.