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Finding the Fourth Proportional to 100,158.78, 138,219.06 and 57,741.90

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Solution

The fourth proportional to 100,158.78, 138,219.06 and 57,741.90 is: 79,683.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,158.78 : 138,219.06 = 57,741.90 : x
  2. Step 2: Convert to fraction form
    100,158.78/138,219.06 = 57,741.90/x
  3. Step 3: Cross multiply
    100,158.78x = 138,219.06 × 57,741.90
  4. Step 4: Simplify right side
    100,158.78x = 7,981,031,140.61
  5. Step 5: Solve for x
    x = 7,981,031,140.61/100,158.78
  6. Step 6: Final answer
    x = 79,683.79

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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.