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Finding the Fourth Proportional to 109.92, 163.80 and 100.32

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Solution

The fourth proportional to 109.92, 163.80 and 100.32 is: 149.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.92 : 163.80 = 100.32 : x
  2. Step 2: Convert to fraction form
    109.92/163.80 = 100.32/x
  3. Step 3: Cross multiply
    109.92x = 163.80 × 100.32
  4. Step 4: Simplify right side
    109.92x = 16,432.42
  5. Step 5: Solve for x
    x = 16,432.42/109.92
  6. Step 6: Final answer
    x = 149.49

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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.