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Finding the Fourth Proportional to 209.74, 315.14 and 132.74

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Solution

The fourth proportional to 209.74, 315.14 and 132.74 is: 199.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.74 : 315.14 = 132.74 : x
  2. Step 2: Convert to fraction form
    209.74/315.14 = 132.74/x
  3. Step 3: Cross multiply
    209.74x = 315.14 × 132.74
  4. Step 4: Simplify right side
    209.74x = 41,831.37
  5. Step 5: Solve for x
    x = 41,831.37/209.74
  6. Step 6: Final answer
    x = 199.44

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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.