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Finding the Fourth Proportional to 247.91, 370.20 and 209.43

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Solution

The fourth proportional to 247.91, 370.20 and 209.43 is: 312.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.91 : 370.20 = 209.43 : x
  2. Step 2: Convert to fraction form
    247.91/370.20 = 209.43/x
  3. Step 3: Cross multiply
    247.91x = 370.20 × 209.43
  4. Step 4: Simplify right side
    247.91x = 77,530.99
  5. Step 5: Solve for x
    x = 77,530.99/247.91
  6. Step 6: Final answer
    x = 312.74

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.