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Finding the Fourth Proportional to 31.18, 42.99 and 23.38

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Solution

The fourth proportional to 31.18, 42.99 and 23.38 is: 32.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.18 : 42.99 = 23.38 : x
  2. Step 2: Convert to fraction form
    31.18/42.99 = 23.38/x
  3. Step 3: Cross multiply
    31.18x = 42.99 × 23.38
  4. Step 4: Simplify right side
    31.18x = 1,004.97
  5. Step 5: Solve for x
    x = 1,004.97/31.18
  6. Step 6: Final answer
    x = 32.23

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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.