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Finding the Fourth Proportional to 31.42, 47.18 and 28.59

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Solution

The fourth proportional to 31.42, 47.18 and 28.59 is: 42.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.42 : 47.18 = 28.59 : x
  2. Step 2: Convert to fraction form
    31.42/47.18 = 28.59/x
  3. Step 3: Cross multiply
    31.42x = 47.18 × 28.59
  4. Step 4: Simplify right side
    31.42x = 1,348.88
  5. Step 5: Solve for x
    x = 1,348.88/31.42
  6. Step 6: Final answer
    x = 42.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.