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Finding the Fourth Proportional to 27.56, 37.98 and 21.42

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Solution

The fourth proportional to 27.56, 37.98 and 21.42 is: 29.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.56 : 37.98 = 21.42 : x
  2. Step 2: Convert to fraction form
    27.56/37.98 = 21.42/x
  3. Step 3: Cross multiply
    27.56x = 37.98 × 21.42
  4. Step 4: Simplify right side
    27.56x = 813.53
  5. Step 5: Solve for x
    x = 813.53/27.56
  6. Step 6: Final answer
    x = 29.52

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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.