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Finding the Fourth Proportional to 179.70, 247.90 and 109.75

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Solution

The fourth proportional to 179.70, 247.90 and 109.75 is: 151.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.70 : 247.90 = 109.75 : x
  2. Step 2: Convert to fraction form
    179.70/247.90 = 109.75/x
  3. Step 3: Cross multiply
    179.70x = 247.90 × 109.75
  4. Step 4: Simplify right side
    179.70x = 27,207.03
  5. Step 5: Solve for x
    x = 27,207.03/179.70
  6. Step 6: Final answer
    x = 151.40

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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.