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Finding the Fourth Proportional to 80.94, 121.28 and 64.88

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Solution

The fourth proportional to 80.94, 121.28 and 64.88 is: 97.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.94 : 121.28 = 64.88 : x
  2. Step 2: Convert to fraction form
    80.94/121.28 = 64.88/x
  3. Step 3: Cross multiply
    80.94x = 121.28 × 64.88
  4. Step 4: Simplify right side
    80.94x = 7,867.72
  5. Step 5: Solve for x
    x = 7,867.72/80.94
  6. Step 6: Final answer
    x = 97.20

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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.