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Finding the Fourth Proportional to 109.25, 150.78 and 76.48

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Solution

The fourth proportional to 109.25, 150.78 and 76.48 is: 105.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.25 : 150.78 = 76.48 : x
  2. Step 2: Convert to fraction form
    109.25/150.78 = 76.48/x
  3. Step 3: Cross multiply
    109.25x = 150.78 × 76.48
  4. Step 4: Simplify right side
    109.25x = 11,531.65
  5. Step 5: Solve for x
    x = 11,531.65/109.25
  6. Step 6: Final answer
    x = 105.55

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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.