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Finding the Fourth Proportional to 20.77, 28.67 and 20.18

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Solution

The fourth proportional to 20.77, 28.67 and 20.18 is: 27.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.77 : 28.67 = 20.18 : x
  2. Step 2: Convert to fraction form
    20.77/28.67 = 20.18/x
  3. Step 3: Cross multiply
    20.77x = 28.67 × 20.18
  4. Step 4: Simplify right side
    20.77x = 578.53
  5. Step 5: Solve for x
    x = 578.53/20.77
  6. Step 6: Final answer
    x = 27.86

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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.