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Finding the Fourth Proportional to 31.37, 47.15 and 17.87

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Solution

The fourth proportional to 31.37, 47.15 and 17.87 is: 26.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.37 : 47.15 = 17.87 : x
  2. Step 2: Convert to fraction form
    31.37/47.15 = 17.87/x
  3. Step 3: Cross multiply
    31.37x = 47.15 × 17.87
  4. Step 4: Simplify right side
    31.37x = 842.25
  5. Step 5: Solve for x
    x = 842.25/31.37
  6. Step 6: Final answer
    x = 26.85

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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.