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Finding the Fourth Proportional to 80.99, 121.32 and 46.70

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Solution

The fourth proportional to 80.99, 121.32 and 46.70 is: 69.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.99 : 121.32 = 46.70 : x
  2. Step 2: Convert to fraction form
    80.99/121.32 = 46.70/x
  3. Step 3: Cross multiply
    80.99x = 121.32 × 46.70
  4. Step 4: Simplify right side
    80.99x = 5,665.04
  5. Step 5: Solve for x
    x = 5,665.04/80.99
  6. Step 6: Final answer
    x = 69.95

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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.