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Finding the Fourth Proportional to 440.20, 660.47 and 209.14

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Solution

The fourth proportional to 440.20, 660.47 and 209.14 is: 313.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.20 : 660.47 = 209.14 : x
  2. Step 2: Convert to fraction form
    440.20/660.47 = 209.14/x
  3. Step 3: Cross multiply
    440.20x = 660.47 × 209.14
  4. Step 4: Simplify right side
    440.20x = 138,130.70
  5. Step 5: Solve for x
    x = 138,130.70/440.20
  6. Step 6: Final answer
    x = 313.79

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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.