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Finding the Fourth Proportional to 269.72, 405.48 and 208.88

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Solution

The fourth proportional to 269.72, 405.48 and 208.88 is: 314.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.72 : 405.48 = 208.88 : x
  2. Step 2: Convert to fraction form
    269.72/405.48 = 208.88/x
  3. Step 3: Cross multiply
    269.72x = 405.48 × 208.88
  4. Step 4: Simplify right side
    269.72x = 84,696.66
  5. Step 5: Solve for x
    x = 84,696.66/269.72
  6. Step 6: Final answer
    x = 314.02

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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.