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Finding the Fourth Proportional to 61.08, 91.20 and 54.24

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Solution

The fourth proportional to 61.08, 91.20 and 54.24 is: 80.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.08 : 91.20 = 54.24 : x
  2. Step 2: Convert to fraction form
    61.08/91.20 = 54.24/x
  3. Step 3: Cross multiply
    61.08x = 91.20 × 54.24
  4. Step 4: Simplify right side
    61.08x = 4,946.69
  5. Step 5: Solve for x
    x = 4,946.69/61.08
  6. Step 6: Final answer
    x = 80.99

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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.