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Finding the Fourth Proportional to 22.03, 32.90 and 20.86

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Solution

The fourth proportional to 22.03, 32.90 and 20.86 is: 31.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.03 : 32.90 = 20.86 : x
  2. Step 2: Convert to fraction form
    22.03/32.90 = 20.86/x
  3. Step 3: Cross multiply
    22.03x = 32.90 × 20.86
  4. Step 4: Simplify right side
    22.03x = 686.11
  5. Step 5: Solve for x
    x = 686.11/22.03
  6. Step 6: Final answer
    x = 31.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.