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Finding the Fourth Proportional to 61.75, 92.62 and 21.15

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Solution

The fourth proportional to 61.75, 92.62 and 21.15 is: 31.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.75 : 92.62 = 21.15 : x
  2. Step 2: Convert to fraction form
    61.75/92.62 = 21.15/x
  3. Step 3: Cross multiply
    61.75x = 92.62 × 21.15
  4. Step 4: Simplify right side
    61.75x = 1,959.23
  5. Step 5: Solve for x
    x = 1,959.23/61.75
  6. Step 6: Final answer
    x = 31.73

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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.