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Finding the Fourth Proportional to 31.61, 43.60 and 27.94

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Solution

The fourth proportional to 31.61, 43.60 and 27.94 is: 38.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.61 : 43.60 = 27.94 : x
  2. Step 2: Convert to fraction form
    31.61/43.60 = 27.94/x
  3. Step 3: Cross multiply
    31.61x = 43.60 × 27.94
  4. Step 4: Simplify right side
    31.61x = 1,218.18
  5. Step 5: Solve for x
    x = 1,218.18/31.61
  6. Step 6: Final answer
    x = 38.54

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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.