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Finding the Fourth Proportional to 24.79, 34.09 and 21.72

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Solution

The fourth proportional to 24.79, 34.09 and 21.72 is: 29.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    24.79 : 34.09 = 21.72 : x
  2. Step 2: Convert to fraction form
    24.79/34.09 = 21.72/x
  3. Step 3: Cross multiply
    24.79x = 34.09 × 21.72
  4. Step 4: Simplify right side
    24.79x = 740.16
  5. Step 5: Solve for x
    x = 740.16/24.79
  6. Step 6: Final answer
    x = 29.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.