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Finding the Fourth Proportional to 61.21, 91.72 and 54.46

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Solution

The fourth proportional to 61.21, 91.72 and 54.46 is: 81.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.21 : 91.72 = 54.46 : x
  2. Step 2: Convert to fraction form
    61.21/91.72 = 54.46/x
  3. Step 3: Cross multiply
    61.21x = 91.72 × 54.46
  4. Step 4: Simplify right side
    61.21x = 4,995.07
  5. Step 5: Solve for x
    x = 4,995.07/61.21
  6. Step 6: Final answer
    x = 81.61

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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.