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Finding the Fourth Proportional to 109.89, 151.70 and 80.46

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Solution

The fourth proportional to 109.89, 151.70 and 80.46 is: 111.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.89 : 151.70 = 80.46 : x
  2. Step 2: Convert to fraction form
    109.89/151.70 = 80.46/x
  3. Step 3: Cross multiply
    109.89x = 151.70 × 80.46
  4. Step 4: Simplify right side
    109.89x = 12,205.38
  5. Step 5: Solve for x
    x = 12,205.38/109.89
  6. Step 6: Final answer
    x = 111.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.