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Finding the Fourth Proportional to 648.11, 972.17 and 185.91

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Solution

The fourth proportional to 648.11, 972.17 and 185.91 is: 278.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.11 : 972.17 = 185.91 : x
  2. Step 2: Convert to fraction form
    648.11/972.17 = 185.91/x
  3. Step 3: Cross multiply
    648.11x = 972.17 × 185.91
  4. Step 4: Simplify right side
    648.11x = 180,732.25
  5. Step 5: Solve for x
    x = 180,732.25/648.11
  6. Step 6: Final answer
    x = 278.86

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Double scale
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Similar ratio
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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.