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Finding the Fourth Proportional to 31.24, 46.85 and 13.19

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Solution

The fourth proportional to 31.24, 46.85 and 13.19 is: 19.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.24 : 46.85 = 13.19 : x
  2. Step 2: Convert to fraction form
    31.24/46.85 = 13.19/x
  3. Step 3: Cross multiply
    31.24x = 46.85 × 13.19
  4. Step 4: Simplify right side
    31.24x = 617.89
  5. Step 5: Solve for x
    x = 617.89/31.24
  6. Step 6: Final answer
    x = 19.78

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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.