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Finding the Fourth Proportional to 31.76, 47.45 and 29.36

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Solution

The fourth proportional to 31.76, 47.45 and 29.36 is: 43.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.76 : 47.45 = 29.36 : x
  2. Step 2: Convert to fraction form
    31.76/47.45 = 29.36/x
  3. Step 3: Cross multiply
    31.76x = 47.45 × 29.36
  4. Step 4: Simplify right side
    31.76x = 1,393.13
  5. Step 5: Solve for x
    x = 1,393.13/31.76
  6. Step 6: Final answer
    x = 43.86

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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.