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Finding the Fourth Proportional to 109.74, 163.54 and 106.86

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Solution

The fourth proportional to 109.74, 163.54 and 106.86 is: 159.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.74 : 163.54 = 106.86 : x
  2. Step 2: Convert to fraction form
    109.74/163.54 = 106.86/x
  3. Step 3: Cross multiply
    109.74x = 163.54 × 106.86
  4. Step 4: Simplify right side
    109.74x = 17,475.88
  5. Step 5: Solve for x
    x = 17,475.88/109.74
  6. Step 6: Final answer
    x = 159.25

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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.