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Finding the Fourth Proportional to 209.52, 315.90 and 191.52

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Solution

The fourth proportional to 209.52, 315.90 and 191.52 is: 288.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.52 : 315.90 = 191.52 : x
  2. Step 2: Convert to fraction form
    209.52/315.90 = 191.52/x
  3. Step 3: Cross multiply
    209.52x = 315.90 × 191.52
  4. Step 4: Simplify right side
    209.52x = 60,501.17
  5. Step 5: Solve for x
    x = 60,501.17/209.52
  6. Step 6: Final answer
    x = 288.76

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.