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Finding the Fourth Proportional to 61.35, 91.54 and 54.52

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Solution

The fourth proportional to 61.35, 91.54 and 54.52 is: 81.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.35 : 91.54 = 54.52 : x
  2. Step 2: Convert to fraction form
    61.35/91.54 = 54.52/x
  3. Step 3: Cross multiply
    61.35x = 91.54 × 54.52
  4. Step 4: Simplify right side
    61.35x = 4,990.30
  5. Step 5: Solve for x
    x = 4,990.30/61.35
  6. Step 6: Final answer
    x = 81.34

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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.