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Finding the Fourth Proportional to 61.49, 92.20 and 20.91

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Solution

The fourth proportional to 61.49, 92.20 and 20.91 is: 31.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.49 : 92.20 = 20.91 : x
  2. Step 2: Convert to fraction form
    61.49/92.20 = 20.91/x
  3. Step 3: Cross multiply
    61.49x = 92.20 × 20.91
  4. Step 4: Simplify right side
    61.49x = 1,927.90
  5. Step 5: Solve for x
    x = 1,927.90/61.49
  6. Step 6: Final answer
    x = 31.35

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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.