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Finding the Fourth Proportional to 22.73, 31.18 and 20.68

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Solution

The fourth proportional to 22.73, 31.18 and 20.68 is: 28.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.73 : 31.18 = 20.68 : x
  2. Step 2: Convert to fraction form
    22.73/31.18 = 20.68/x
  3. Step 3: Cross multiply
    22.73x = 31.18 × 20.68
  4. Step 4: Simplify right side
    22.73x = 644.74
  5. Step 5: Solve for x
    x = 644.74/22.73
  6. Step 6: Final answer
    x = 28.36

Related Problems

Find fourth proportional to 11.37, 15.59 and 10.34
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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 (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.