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Finding the Fourth Proportional to 31.89, 43.98 and 30.18

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Solution

The fourth proportional to 31.89, 43.98 and 30.18 is: 41.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.89 : 43.98 = 30.18 : x
  2. Step 2: Convert to fraction form
    31.89/43.98 = 30.18/x
  3. Step 3: Cross multiply
    31.89x = 43.98 × 30.18
  4. Step 4: Simplify right side
    31.89x = 1,327.48
  5. Step 5: Solve for x
    x = 1,327.48/31.89
  6. Step 6: Final answer
    x = 41.62

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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.