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Finding the Fourth Proportional to 80.84, 121.26 and 26.72

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Solution

The fourth proportional to 80.84, 121.26 and 26.72 is: 40.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.84 : 121.26 = 26.72 : x
  2. Step 2: Convert to fraction form
    80.84/121.26 = 26.72/x
  3. Step 3: Cross multiply
    80.84x = 121.26 × 26.72
  4. Step 4: Simplify right side
    80.84x = 3,240.07
  5. Step 5: Solve for x
    x = 3,240.07/80.84
  6. Step 6: Final answer
    x = 40.08

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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.