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Finding the Fourth Proportional to 100.01, 138.09 and 87.86

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Solution

The fourth proportional to 100.01, 138.09 and 87.86 is: 121.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.01 : 138.09 = 87.86 : x
  2. Step 2: Convert to fraction form
    100.01/138.09 = 87.86/x
  3. Step 3: Cross multiply
    100.01x = 138.09 × 87.86
  4. Step 4: Simplify right side
    100.01x = 12,132.59
  5. Step 5: Solve for x
    x = 12,132.59/100.01
  6. Step 6: Final answer
    x = 121.31

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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.