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Finding the Fourth Proportional to 27.18, 37.40 and 21.71

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Solution

The fourth proportional to 27.18, 37.40 and 21.71 is: 29.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.18 : 37.40 = 21.71 : x
  2. Step 2: Convert to fraction form
    27.18/37.40 = 21.71/x
  3. Step 3: Cross multiply
    27.18x = 37.40 × 21.71
  4. Step 4: Simplify right side
    27.18x = 811.66
  5. Step 5: Solve for x
    x = 811.66/27.18
  6. Step 6: Final answer
    x = 29.86

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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.