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Finding the Fourth Proportional to 347, 478.86 and 209.08

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Solution

The fourth proportional to 347, 478.86 and 209.08 is: 288.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    347 : 478.86 = 209.08 : x
  2. Step 2: Convert to fraction form
    347/478.86 = 209.08/x
  3. Step 3: Cross multiply
    347x = 478.86 × 209.08
  4. Step 4: Simplify right side
    347x = 100,120.05
  5. Step 5: Solve for x
    x = 100,120.05/347
  6. Step 6: Final answer
    x = 288.53

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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.