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Finding the Fourth Proportional to 31.25, 46.87 and 8.42

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Solution

The fourth proportional to 31.25, 46.87 and 8.42 is: 12.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.25 : 46.87 = 8.42 : x
  2. Step 2: Convert to fraction form
    31.25/46.87 = 8.42/x
  3. Step 3: Cross multiply
    31.25x = 46.87 × 8.42
  4. Step 4: Simplify right side
    31.25x = 394.88
  5. Step 5: Solve for x
    x = 394.88/31.25
  6. Step 6: Final answer
    x = 12.64

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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.