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Finding the Fourth Proportional to 100,631.81, 138,873.52 and 57,611.13

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Solution

The fourth proportional to 100,631.81, 138,873.52 and 57,611.13 is: 79,504.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,631.81 : 138,873.52 = 57,611.13 : x
  2. Step 2: Convert to fraction form
    100,631.81/138,873.52 = 57,611.13/x
  3. Step 3: Cross multiply
    100,631.81x = 138,873.52 × 57,611.13
  4. Step 4: Simplify right side
    100,631.81x = 8,000,660,414.28
  5. Step 5: Solve for x
    x = 8,000,660,414.28/100,631.81
  6. Step 6: Final answer
    x = 79,504.29

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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.