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Finding the Fourth Proportional to 209.52, 287.82 and 187.74

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Solution

The fourth proportional to 209.52, 287.82 and 187.74 is: 257.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.52 : 287.82 = 187.74 : x
  2. Step 2: Convert to fraction form
    209.52/287.82 = 187.74/x
  3. Step 3: Cross multiply
    209.52x = 287.82 × 187.74
  4. Step 4: Simplify right side
    209.52x = 54,035.33
  5. Step 5: Solve for x
    x = 54,035.33/209.52
  6. Step 6: Final answer
    x = 257.90

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.