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Finding the Fourth Proportional to 209.49, 313.59 and 151.56

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Solution

The fourth proportional to 209.49, 313.59 and 151.56 is: 226.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.49 : 313.59 = 151.56 : x
  2. Step 2: Convert to fraction form
    209.49/313.59 = 151.56/x
  3. Step 3: Cross multiply
    209.49x = 313.59 × 151.56
  4. Step 4: Simplify right side
    209.49x = 47,527.70
  5. Step 5: Solve for x
    x = 47,527.70/209.49
  6. Step 6: Final answer
    x = 226.87

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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.