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Finding the Fourth Proportional to 43.80, 60.47 and 30.72

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Solution

The fourth proportional to 43.80, 60.47 and 30.72 is: 42.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.80 : 60.47 = 30.72 : x
  2. Step 2: Convert to fraction form
    43.80/60.47 = 30.72/x
  3. Step 3: Cross multiply
    43.80x = 60.47 × 30.72
  4. Step 4: Simplify right side
    43.80x = 1,857.48
  5. Step 5: Solve for x
    x = 1,857.48/43.80
  6. Step 6: Final answer
    x = 42.41

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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.