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Finding the Fourth Proportional to 61.96, 92.81 and 31.46

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Solution

The fourth proportional to 61.96, 92.81 and 31.46 is: 47.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.96 : 92.81 = 31.46 : x
  2. Step 2: Convert to fraction form
    61.96/92.81 = 31.46/x
  3. Step 3: Cross multiply
    61.96x = 92.81 × 31.46
  4. Step 4: Simplify right side
    61.96x = 2,919.65
  5. Step 5: Solve for x
    x = 2,919.65/61.96
  6. Step 6: Final answer
    x = 47.12

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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.