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Finding the Fourth Proportional to 100,371.30, 138,164.66 and 86,753.10

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Solution

The fourth proportional to 100,371.30, 138,164.66 and 86,753.10 is: 119,418.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,371.30 : 138,164.66 = 86,753.10 : x
  2. Step 2: Convert to fraction form
    100,371.30/138,164.66 = 86,753.10/x
  3. Step 3: Cross multiply
    100,371.30x = 138,164.66 × 86,753.10
  4. Step 4: Simplify right side
    100,371.30x = 11,986,212,565.45
  5. Step 5: Solve for x
    x = 11,986,212,565.45/100,371.30
  6. Step 6: Final answer
    x = 119,418.72

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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.