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Finding the Fourth Proportional to 109.24, 150.80 and 78.18

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Solution

The fourth proportional to 109.24, 150.80 and 78.18 is: 107.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.24 : 150.80 = 78.18 : x
  2. Step 2: Convert to fraction form
    109.24/150.80 = 78.18/x
  3. Step 3: Cross multiply
    109.24x = 150.80 × 78.18
  4. Step 4: Simplify right side
    109.24x = 11,789.54
  5. Step 5: Solve for x
    x = 11,789.54/109.24
  6. Step 6: Final answer
    x = 107.92

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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.