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Finding the Fourth Proportional to 22.74, 31.38 and 20

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Solution

The fourth proportional to 22.74, 31.38 and 20 is: 27.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    22.74 : 31.38 = 20 : x
  2. Step 2: Convert to fraction form
    22.74/31.38 = 20/x
  3. Step 3: Cross multiply
    22.74x = 31.38 × 20
  4. Step 4: Simplify right side
    22.74x = 627.60
  5. Step 5: Solve for x
    x = 627.60/22.74
  6. Step 6: Final answer
    x = 27.60

Related Problems

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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.