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Finding the Fourth Proportional to 22.69, 31.36 and 20.49

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Solution

The fourth proportional to 22.69, 31.36 and 20.49 is: 28.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.69 : 31.36 = 20.49 : x
  2. Step 2: Convert to fraction form
    22.69/31.36 = 20.49/x
  3. Step 3: Cross multiply
    22.69x = 31.36 × 20.49
  4. Step 4: Simplify right side
    22.69x = 642.57
  5. Step 5: Solve for x
    x = 642.57/22.69
  6. Step 6: Final answer
    x = 28.32

Related Problems

Find fourth proportional to 11.35, 15.68 and 10.25
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Double scale
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Similar ratio
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1.5x scale

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.