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Finding the Fourth Proportional to 80.79, 121.06 and 45.99

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Solution

The fourth proportional to 80.79, 121.06 and 45.99 is: 68.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.79 : 121.06 = 45.99 : x
  2. Step 2: Convert to fraction form
    80.79/121.06 = 45.99/x
  3. Step 3: Cross multiply
    80.79x = 121.06 × 45.99
  4. Step 4: Simplify right side
    80.79x = 5,567.61
  5. Step 5: Solve for x
    x = 5,567.61/80.79
  6. Step 6: Final answer
    x = 68.92

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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.