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Finding the Fourth Proportional to 209.24, 288.88 and 135.66

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Solution

The fourth proportional to 209.24, 288.88 and 135.66 is: 187.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.24 : 288.88 = 135.66 : x
  2. Step 2: Convert to fraction form
    209.24/288.88 = 135.66/x
  3. Step 3: Cross multiply
    209.24x = 288.88 × 135.66
  4. Step 4: Simplify right side
    209.24x = 39,189.46
  5. Step 5: Solve for x
    x = 39,189.46/209.24
  6. Step 6: Final answer
    x = 187.29

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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.