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Finding the Fourth Proportional to 28.01, 38.66 and 15.74

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Solution

The fourth proportional to 28.01, 38.66 and 15.74 is: 21.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.01 : 38.66 = 15.74 : x
  2. Step 2: Convert to fraction form
    28.01/38.66 = 15.74/x
  3. Step 3: Cross multiply
    28.01x = 38.66 × 15.74
  4. Step 4: Simplify right side
    28.01x = 608.24
  5. Step 5: Solve for x
    x = 608.24/28.01
  6. Step 6: Final answer
    x = 21.71

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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.