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Finding the Fourth Proportional to 209.72, 314.54 and 112.17

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Solution

The fourth proportional to 209.72, 314.54 and 112.17 is: 168.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.72 : 314.54 = 112.17 : x
  2. Step 2: Convert to fraction form
    209.72/314.54 = 112.17/x
  3. Step 3: Cross multiply
    209.72x = 314.54 × 112.17
  4. Step 4: Simplify right side
    209.72x = 35,281.39
  5. Step 5: Solve for x
    x = 35,281.39/209.72
  6. Step 6: Final answer
    x = 168.23

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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.