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Finding the Fourth Proportional to 74.82, 112.36 and 61.16

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Solution

The fourth proportional to 74.82, 112.36 and 61.16 is: 91.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.82 : 112.36 = 61.16 : x
  2. Step 2: Convert to fraction form
    74.82/112.36 = 61.16/x
  3. Step 3: Cross multiply
    74.82x = 112.36 × 61.16
  4. Step 4: Simplify right side
    74.82x = 6,871.94
  5. Step 5: Solve for x
    x = 6,871.94/74.82
  6. Step 6: Final answer
    x = 91.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.