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Finding the Fourth Proportional to 31.83, 47.42 and 30.12

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Solution

The fourth proportional to 31.83, 47.42 and 30.12 is: 44.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.83 : 47.42 = 30.12 : x
  2. Step 2: Convert to fraction form
    31.83/47.42 = 30.12/x
  3. Step 3: Cross multiply
    31.83x = 47.42 × 30.12
  4. Step 4: Simplify right side
    31.83x = 1,428.14
  5. Step 5: Solve for x
    x = 1,428.14/31.83
  6. Step 6: Final answer
    x = 44.87

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.