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Finding the Fourth Proportional to 209.46, 288.78 and 135.66

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Solution

The fourth proportional to 209.46, 288.78 and 135.66 is: 187.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.46 : 288.78 = 135.66 : x
  2. Step 2: Convert to fraction form
    209.46/288.78 = 135.66/x
  3. Step 3: Cross multiply
    209.46x = 288.78 × 135.66
  4. Step 4: Simplify right side
    209.46x = 39,175.89
  5. Step 5: Solve for x
    x = 39,175.89/209.46
  6. Step 6: Final answer
    x = 187.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.