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Finding the Fourth Proportional to 138,871.32, 208,139.94 and 79,744.92

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Solution

The fourth proportional to 138,871.32, 208,139.94 and 79,744.92 is: 119,521.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,871.32 : 208,139.94 = 79,744.92 : x
  2. Step 2: Convert to fraction form
    138,871.32/208,139.94 = 79,744.92/x
  3. Step 3: Cross multiply
    138,871.32x = 208,139.94 × 79,744.92
  4. Step 4: Simplify right side
    138,871.32x = 16,598,102,864.10
  5. Step 5: Solve for x
    x = 16,598,102,864.10/138,871.32
  6. Step 6: Final answer
    x = 119,521.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.