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Finding the Fourth Proportional to 109.20, 150.51 and 79.65

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Solution

The fourth proportional to 109.20, 150.51 and 79.65 is: 109.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.20 : 150.51 = 79.65 : x
  2. Step 2: Convert to fraction form
    109.20/150.51 = 79.65/x
  3. Step 3: Cross multiply
    109.20x = 150.51 × 79.65
  4. Step 4: Simplify right side
    109.20x = 11,988.12
  5. Step 5: Solve for x
    x = 11,988.12/109.20
  6. Step 6: Final answer
    x = 109.78

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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.