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Finding the Fourth Proportional to 22.59, 31.34 and 21.90

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Solution

The fourth proportional to 22.59, 31.34 and 21.90 is: 30.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.59 : 31.34 = 21.90 : x
  2. Step 2: Convert to fraction form
    22.59/31.34 = 21.90/x
  3. Step 3: Cross multiply
    22.59x = 31.34 × 21.90
  4. Step 4: Simplify right side
    22.59x = 686.24
  5. Step 5: Solve for x
    x = 686.24/22.59
  6. Step 6: Final answer
    x = 30.38

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.