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Finding the Fourth Proportional to 43.70, 60.24 and 31.40

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Solution

The fourth proportional to 43.70, 60.24 and 31.40 is: 43.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.70 : 60.24 = 31.40 : x
  2. Step 2: Convert to fraction form
    43.70/60.24 = 31.40/x
  3. Step 3: Cross multiply
    43.70x = 60.24 × 31.40
  4. Step 4: Simplify right side
    43.70x = 1,891.54
  5. Step 5: Solve for x
    x = 1,891.54/43.70
  6. Step 6: Final answer
    x = 43.28

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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.