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Finding the Fourth Proportional to 167.72, 231.30 and 109.40

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Solution

The fourth proportional to 167.72, 231.30 and 109.40 is: 150.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.72 : 231.30 = 109.40 : x
  2. Step 2: Convert to fraction form
    167.72/231.30 = 109.40/x
  3. Step 3: Cross multiply
    167.72x = 231.30 × 109.40
  4. Step 4: Simplify right side
    167.72x = 25,303.06
  5. Step 5: Solve for x
    x = 25,303.06/167.72
  6. Step 6: Final answer
    x = 150.87

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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.