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Finding the Fourth Proportional to 347.31, 479.18 and 209.31

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Solution

The fourth proportional to 347.31, 479.18 and 209.31 is: 288.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.31 : 479.18 = 209.31 : x
  2. Step 2: Convert to fraction form
    347.31/479.18 = 209.31/x
  3. Step 3: Cross multiply
    347.31x = 479.18 × 209.31
  4. Step 4: Simplify right side
    347.31x = 100,296.12
  5. Step 5: Solve for x
    x = 100,296.12/347.31
  6. Step 6: Final answer
    x = 288.78

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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.