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Finding the Fourth Proportional to 27.17, 40.91 and 20.45

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Solution

The fourth proportional to 27.17, 40.91 and 20.45 is: 30.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.17 : 40.91 = 20.45 : x
  2. Step 2: Convert to fraction form
    27.17/40.91 = 20.45/x
  3. Step 3: Cross multiply
    27.17x = 40.91 × 20.45
  4. Step 4: Simplify right side
    27.17x = 836.61
  5. Step 5: Solve for x
    x = 836.61/27.17
  6. Step 6: Final answer
    x = 30.79

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.