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Finding the Fourth Proportional to 109.80, 151.65 and 80.43

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Solution

The fourth proportional to 109.80, 151.65 and 80.43 is: 111.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.80 : 151.65 = 80.43 : x
  2. Step 2: Convert to fraction form
    109.80/151.65 = 80.43/x
  3. Step 3: Cross multiply
    109.80x = 151.65 × 80.43
  4. Step 4: Simplify right side
    109.80x = 12,196.45
  5. Step 5: Solve for x
    x = 12,196.45/109.80
  6. Step 6: Final answer
    x = 111.08

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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.