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Finding the Fourth Proportional to 31.71, 43.49 and 31.47

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Solution

The fourth proportional to 31.71, 43.49 and 31.47 is: 43.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.71 : 43.49 = 31.47 : x
  2. Step 2: Convert to fraction form
    31.71/43.49 = 31.47/x
  3. Step 3: Cross multiply
    31.71x = 43.49 × 31.47
  4. Step 4: Simplify right side
    31.71x = 1,368.47
  5. Step 5: Solve for x
    x = 1,368.47/31.71
  6. Step 6: Final answer
    x = 43.16

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.