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Finding the Fourth Proportional to 47.80, 66.31 and 43.48

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Solution

The fourth proportional to 47.80, 66.31 and 43.48 is: 60.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.80 : 66.31 = 43.48 : x
  2. Step 2: Convert to fraction form
    47.80/66.31 = 43.48/x
  3. Step 3: Cross multiply
    47.80x = 66.31 × 43.48
  4. Step 4: Simplify right side
    47.80x = 2,883.16
  5. Step 5: Solve for x
    x = 2,883.16/47.80
  6. Step 6: Final answer
    x = 60.32

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.