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Finding the Fourth Proportional to 109.52, 163.31 and 100.65

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Solution

The fourth proportional to 109.52, 163.31 and 100.65 is: 150.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.52 : 163.31 = 100.65 : x
  2. Step 2: Convert to fraction form
    109.52/163.31 = 100.65/x
  3. Step 3: Cross multiply
    109.52x = 163.31 × 100.65
  4. Step 4: Simplify right side
    109.52x = 16,437.15
  5. Step 5: Solve for x
    x = 16,437.15/109.52
  6. Step 6: Final answer
    x = 150.09

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.