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Finding the Fourth Proportional to 22.90, 31.66 and 20.88

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Solution

The fourth proportional to 22.90, 31.66 and 20.88 is: 28.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.90 : 31.66 = 20.88 : x
  2. Step 2: Convert to fraction form
    22.90/31.66 = 20.88/x
  3. Step 3: Cross multiply
    22.90x = 31.66 × 20.88
  4. Step 4: Simplify right side
    22.90x = 661.06
  5. Step 5: Solve for x
    x = 661.06/22.90
  6. Step 6: Final answer
    x = 28.87

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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.