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Finding the Fourth Proportional to 20.79, 28.62 and 18.77

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Solution

The fourth proportional to 20.79, 28.62 and 18.77 is: 25.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.79 : 28.62 = 18.77 : x
  2. Step 2: Convert to fraction form
    20.79/28.62 = 18.77/x
  3. Step 3: Cross multiply
    20.79x = 28.62 × 18.77
  4. Step 4: Simplify right side
    20.79x = 537.05
  5. Step 5: Solve for x
    x = 537.05/20.79
  6. Step 6: Final answer
    x = 25.83

Related Problems

Find fourth proportional to 10.40, 14.31 and 9.38
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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.