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Finding the Fourth Proportional to 31.84, 43.70 and 29.11

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Solution

The fourth proportional to 31.84, 43.70 and 29.11 is: 39.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.84 : 43.70 = 29.11 : x
  2. Step 2: Convert to fraction form
    31.84/43.70 = 29.11/x
  3. Step 3: Cross multiply
    31.84x = 43.70 × 29.11
  4. Step 4: Simplify right side
    31.84x = 1,272.07
  5. Step 5: Solve for x
    x = 1,272.07/31.84
  6. Step 6: Final answer
    x = 39.95

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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.