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Finding the Fourth Proportional to 32.20, 48.28 and 11.91

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Solution

The fourth proportional to 32.20, 48.28 and 11.91 is: 17.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    32.20 : 48.28 = 11.91 : x
  2. Step 2: Convert to fraction form
    32.20/48.28 = 11.91/x
  3. Step 3: Cross multiply
    32.20x = 48.28 × 11.91
  4. Step 4: Simplify right side
    32.20x = 574.91
  5. Step 5: Solve for x
    x = 574.91/32.20
  6. Step 6: Final answer
    x = 17.85

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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.