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Finding the Fourth Proportional to 38.92, 58.30 and 31.80

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Solution

The fourth proportional to 38.92, 58.30 and 31.80 is: 47.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.92 : 58.30 = 31.80 : x
  2. Step 2: Convert to fraction form
    38.92/58.30 = 31.80/x
  3. Step 3: Cross multiply
    38.92x = 58.30 × 31.80
  4. Step 4: Simplify right side
    38.92x = 1,853.94
  5. Step 5: Solve for x
    x = 1,853.94/38.92
  6. Step 6: Final answer
    x = 47.63

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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.