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Finding the Fourth Proportional to 43.78, 60.39 and 31.48

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Solution

The fourth proportional to 43.78, 60.39 and 31.48 is: 43.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.78 : 60.39 = 31.48 : x
  2. Step 2: Convert to fraction form
    43.78/60.39 = 31.48/x
  3. Step 3: Cross multiply
    43.78x = 60.39 × 31.48
  4. Step 4: Simplify right side
    43.78x = 1,901.08
  5. Step 5: Solve for x
    x = 1,901.08/43.78
  6. Step 6: Final answer
    x = 43.42

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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.