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Finding the Fourth Proportional to 80.94, 121.45 and 38.19

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Solution

The fourth proportional to 80.94, 121.45 and 38.19 is: 57.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.94 : 121.45 = 38.19 : x
  2. Step 2: Convert to fraction form
    80.94/121.45 = 38.19/x
  3. Step 3: Cross multiply
    80.94x = 121.45 × 38.19
  4. Step 4: Simplify right side
    80.94x = 4,638.18
  5. Step 5: Solve for x
    x = 4,638.18/80.94
  6. Step 6: Final answer
    x = 57.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.