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Finding the Fourth Proportional to 75.12, 112.12 and 66.47

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Solution

The fourth proportional to 75.12, 112.12 and 66.47 is: 99.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.12 : 112.12 = 66.47 : x
  2. Step 2: Convert to fraction form
    75.12/112.12 = 66.47/x
  3. Step 3: Cross multiply
    75.12x = 112.12 × 66.47
  4. Step 4: Simplify right side
    75.12x = 7,452.62
  5. Step 5: Solve for x
    x = 7,452.62/75.12
  6. Step 6: Final answer
    x = 99.21

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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.