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Finding the Fourth Proportional to 109.10, 163.65 and 74.90

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Solution

The fourth proportional to 109.10, 163.65 and 74.90 is: 112.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.10 : 163.65 = 74.90 : x
  2. Step 2: Convert to fraction form
    109.10/163.65 = 74.90/x
  3. Step 3: Cross multiply
    109.10x = 163.65 × 74.90
  4. Step 4: Simplify right side
    109.10x = 12,257.39
  5. Step 5: Solve for x
    x = 12,257.39/109.10
  6. Step 6: Final answer
    x = 112.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.