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Finding the Fourth Proportional to 100.12, 149.38 and 87.27

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Solution

The fourth proportional to 100.12, 149.38 and 87.27 is: 130.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.12 : 149.38 = 87.27 : x
  2. Step 2: Convert to fraction form
    100.12/149.38 = 87.27/x
  3. Step 3: Cross multiply
    100.12x = 149.38 × 87.27
  4. Step 4: Simplify right side
    100.12x = 13,036.39
  5. Step 5: Solve for x
    x = 13,036.39/100.12
  6. Step 6: Final answer
    x = 130.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.