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Finding the Fourth Proportional to 209.74, 314.70 and 112.21

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Solution

The fourth proportional to 209.74, 314.70 and 112.21 is: 168.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.74 : 314.70 = 112.21 : x
  2. Step 2: Convert to fraction form
    209.74/314.70 = 112.21/x
  3. Step 3: Cross multiply
    209.74x = 314.70 × 112.21
  4. Step 4: Simplify right side
    209.74x = 35,312.71
  5. Step 5: Solve for x
    x = 35,312.71/209.74
  6. Step 6: Final answer
    x = 168.37

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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.