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Finding the Fourth Proportional to 45.57, 62.91 and 31.80

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Solution

The fourth proportional to 45.57, 62.91 and 31.80 is: 43.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.57 : 62.91 = 31.80 : x
  2. Step 2: Convert to fraction form
    45.57/62.91 = 31.80/x
  3. Step 3: Cross multiply
    45.57x = 62.91 × 31.80
  4. Step 4: Simplify right side
    45.57x = 2,000.54
  5. Step 5: Solve for x
    x = 2,000.54/45.57
  6. Step 6: Final answer
    x = 43.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.