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Finding the Fourth Proportional to 22.72, 31.15 and 21.14

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Solution

The fourth proportional to 22.72, 31.15 and 21.14 is: 28.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.72 : 31.15 = 21.14 : x
  2. Step 2: Convert to fraction form
    22.72/31.15 = 21.14/x
  3. Step 3: Cross multiply
    22.72x = 31.15 × 21.14
  4. Step 4: Simplify right side
    22.72x = 658.51
  5. Step 5: Solve for x
    x = 658.51/22.72
  6. Step 6: Final answer
    x = 28.98

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.