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Finding the Fourth Proportional to 27.76, 38.31 and 15.48

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Solution

The fourth proportional to 27.76, 38.31 and 15.48 is: 21.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.76 : 38.31 = 15.48 : x
  2. Step 2: Convert to fraction form
    27.76/38.31 = 15.48/x
  3. Step 3: Cross multiply
    27.76x = 38.31 × 15.48
  4. Step 4: Simplify right side
    27.76x = 592.90
  5. Step 5: Solve for x
    x = 592.90/27.76
  6. Step 6: Final answer
    x = 21.36

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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.