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Finding the Fourth Proportional to 209.15, 313.82 and 87.44

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Solution

The fourth proportional to 209.15, 313.82 and 87.44 is: 131.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.15 : 313.82 = 87.44 : x
  2. Step 2: Convert to fraction form
    209.15/313.82 = 87.44/x
  3. Step 3: Cross multiply
    209.15x = 313.82 × 87.44
  4. Step 4: Simplify right side
    209.15x = 27,440.42
  5. Step 5: Solve for x
    x = 27,440.42/209.15
  6. Step 6: Final answer
    x = 131.20

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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.