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Finding the Fourth Proportional to 31.85, 47.51 and 28.58

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Solution

The fourth proportional to 31.85, 47.51 and 28.58 is: 42.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.85 : 47.51 = 28.58 : x
  2. Step 2: Convert to fraction form
    31.85/47.51 = 28.58/x
  3. Step 3: Cross multiply
    31.85x = 47.51 × 28.58
  4. Step 4: Simplify right side
    31.85x = 1,357.69
  5. Step 5: Solve for x
    x = 1,357.69/31.85
  6. Step 6: Final answer
    x = 42.63

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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.