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Finding the Fourth Proportional to 28.66, 39.61 and 21.74

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Solution

The fourth proportional to 28.66, 39.61 and 21.74 is: 30.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.66 : 39.61 = 21.74 : x
  2. Step 2: Convert to fraction form
    28.66/39.61 = 21.74/x
  3. Step 3: Cross multiply
    28.66x = 39.61 × 21.74
  4. Step 4: Simplify right side
    28.66x = 861.26
  5. Step 5: Solve for x
    x = 861.26/28.66
  6. Step 6: Final answer
    x = 30.05

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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.