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Finding the Fourth Proportional to 31, 46.40 and 29.92

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Solution

The fourth proportional to 31, 46.40 and 29.92 is: 44.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    31 : 46.40 = 29.92 : x
  2. Step 2: Convert to fraction form
    31/46.40 = 29.92/x
  3. Step 3: Cross multiply
    31x = 46.40 × 29.92
  4. Step 4: Simplify right side
    31x = 1,388.14
  5. Step 5: Solve for x
    x = 1,388.14/31
  6. Step 6: Final answer
    x = 44.78

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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.