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Finding the Fourth Proportional to 78.20, 107.92 and 43.23

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Solution

The fourth proportional to 78.20, 107.92 and 43.23 is: 59.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.20 : 107.92 = 43.23 : x
  2. Step 2: Convert to fraction form
    78.20/107.92 = 43.23/x
  3. Step 3: Cross multiply
    78.20x = 107.92 × 43.23
  4. Step 4: Simplify right side
    78.20x = 4,665.68
  5. Step 5: Solve for x
    x = 4,665.68/78.20
  6. Step 6: Final answer
    x = 59.66

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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.