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Finding the Fourth Proportional to 78.92, 108.96 and 54.35

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Solution

The fourth proportional to 78.92, 108.96 and 54.35 is: 75.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.92 : 108.96 = 54.35 : x
  2. Step 2: Convert to fraction form
    78.92/108.96 = 54.35/x
  3. Step 3: Cross multiply
    78.92x = 108.96 × 54.35
  4. Step 4: Simplify right side
    78.92x = 5,921.98
  5. Step 5: Solve for x
    x = 5,921.98/78.92
  6. Step 6: Final answer
    x = 75.04

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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.