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Finding the Fourth Proportional to 313.12, 431.88 and 209.44

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Solution

The fourth proportional to 313.12, 431.88 and 209.44 is: 288.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.12 : 431.88 = 209.44 : x
  2. Step 2: Convert to fraction form
    313.12/431.88 = 209.44/x
  3. Step 3: Cross multiply
    313.12x = 431.88 × 209.44
  4. Step 4: Simplify right side
    313.12x = 90,452.95
  5. Step 5: Solve for x
    x = 90,452.95/313.12
  6. Step 6: Final answer
    x = 288.88

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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.