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Finding the Fourth Proportional to 138,494.62, 191,119.88 and 78,064.12

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Solution

The fourth proportional to 138,494.62, 191,119.88 and 78,064.12 is: 107,726.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,494.62 : 191,119.88 = 78,064.12 : x
  2. Step 2: Convert to fraction form
    138,494.62/191,119.88 = 78,064.12/x
  3. Step 3: Cross multiply
    138,494.62x = 191,119.88 × 78,064.12
  4. Step 4: Simplify right side
    138,494.62x = 14,919,605,680.77
  5. Step 5: Solve for x
    x = 14,919,605,680.77/138,494.62
  6. Step 6: Final answer
    x = 107,726.97

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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.