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Finding the Fourth Proportional to 31.48, 43.38 and 30.06

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Solution

The fourth proportional to 31.48, 43.38 and 30.06 is: 41.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.48 : 43.38 = 30.06 : x
  2. Step 2: Convert to fraction form
    31.48/43.38 = 30.06/x
  3. Step 3: Cross multiply
    31.48x = 43.38 × 30.06
  4. Step 4: Simplify right side
    31.48x = 1,304.00
  5. Step 5: Solve for x
    x = 1,304.00/31.48
  6. Step 6: Final answer
    x = 41.42

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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.