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Finding the Fourth Proportional to 22.70, 34.21 and 20.87

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Solution

The fourth proportional to 22.70, 34.21 and 20.87 is: 31.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.70 : 34.21 = 20.87 : x
  2. Step 2: Convert to fraction form
    22.70/34.21 = 20.87/x
  3. Step 3: Cross multiply
    22.70x = 34.21 × 20.87
  4. Step 4: Simplify right side
    22.70x = 714.02
  5. Step 5: Solve for x
    x = 714.02/22.70
  6. Step 6: Final answer
    x = 31.46

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.