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Finding the Fourth Proportional to 61.12, 91.24 and 60.16

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Solution

The fourth proportional to 61.12, 91.24 and 60.16 is: 89.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.12 : 91.24 = 60.16 : x
  2. Step 2: Convert to fraction form
    61.12/91.24 = 60.16/x
  3. Step 3: Cross multiply
    61.12x = 91.24 × 60.16
  4. Step 4: Simplify right side
    61.12x = 5,489.00
  5. Step 5: Solve for x
    x = 5,489.00/61.12
  6. Step 6: Final answer
    x = 89.81

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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.