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Finding the Fourth Proportional to 209.96, 314.88 and 113.72

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Solution

The fourth proportional to 209.96, 314.88 and 113.72 is: 170.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.96 : 314.88 = 113.72 : x
  2. Step 2: Convert to fraction form
    209.96/314.88 = 113.72/x
  3. Step 3: Cross multiply
    209.96x = 314.88 × 113.72
  4. Step 4: Simplify right side
    209.96x = 35,808.15
  5. Step 5: Solve for x
    x = 35,808.15/209.96
  6. Step 6: Final answer
    x = 170.55

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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.