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Finding the Fourth Proportional to 18, 24.80 and 15.68

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Solution

The fourth proportional to 18, 24.80 and 15.68 is: 21.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18 : 24.80 = 15.68 : x
  2. Step 2: Convert to fraction form
    18/24.80 = 15.68/x
  3. Step 3: Cross multiply
    18x = 24.80 × 15.68
  4. Step 4: Simplify right side
    18x = 388.86
  5. Step 5: Solve for x
    x = 388.86/18
  6. Step 6: Final answer
    x = 21.60

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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.