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Finding the Fourth Proportional to 209.35, 313.36 and 187.33

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Solution

The fourth proportional to 209.35, 313.36 and 187.33 is: 280.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.35 : 313.36 = 187.33 : x
  2. Step 2: Convert to fraction form
    209.35/313.36 = 187.33/x
  3. Step 3: Cross multiply
    209.35x = 313.36 × 187.33
  4. Step 4: Simplify right side
    209.35x = 58,702.04
  5. Step 5: Solve for x
    x = 58,702.04/209.35
  6. Step 6: Final answer
    x = 280.41

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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.