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Finding the Fourth Proportional to 209.19, 313.42 and 111.48

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Solution

The fourth proportional to 209.19, 313.42 and 111.48 is: 167.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.19 : 313.42 = 111.48 : x
  2. Step 2: Convert to fraction form
    209.19/313.42 = 111.48/x
  3. Step 3: Cross multiply
    209.19x = 313.42 × 111.48
  4. Step 4: Simplify right side
    209.19x = 34,939.90
  5. Step 5: Solve for x
    x = 34,939.90/209.19
  6. Step 6: Final answer
    x = 167.03

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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.