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Finding the Fourth Proportional to 31.48, 43.46 and 28.20

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Solution

The fourth proportional to 31.48, 43.46 and 28.20 is: 38.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.48 : 43.46 = 28.20 : x
  2. Step 2: Convert to fraction form
    31.48/43.46 = 28.20/x
  3. Step 3: Cross multiply
    31.48x = 43.46 × 28.20
  4. Step 4: Simplify right side
    31.48x = 1,225.57
  5. Step 5: Solve for x
    x = 1,225.57/31.48
  6. Step 6: Final answer
    x = 38.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.