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Finding the Fourth Proportional to 28.17, 38.89 and 18.47

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Solution

The fourth proportional to 28.17, 38.89 and 18.47 is: 25.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.17 : 38.89 = 18.47 : x
  2. Step 2: Convert to fraction form
    28.17/38.89 = 18.47/x
  3. Step 3: Cross multiply
    28.17x = 38.89 × 18.47
  4. Step 4: Simplify right side
    28.17x = 718.35
  5. Step 5: Solve for x
    x = 718.35/28.17
  6. Step 6: Final answer
    x = 25.50

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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.