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Finding the Fourth Proportional to 75.56, 104.24 and 72.12

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Solution

The fourth proportional to 75.56, 104.24 and 72.12 is: 99.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.56 : 104.24 = 72.12 : x
  2. Step 2: Convert to fraction form
    75.56/104.24 = 72.12/x
  3. Step 3: Cross multiply
    75.56x = 104.24 × 72.12
  4. Step 4: Simplify right side
    75.56x = 7,517.79
  5. Step 5: Solve for x
    x = 7,517.79/75.56
  6. Step 6: Final answer
    x = 99.49

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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.