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Finding the Fourth Proportional to 440.50, 660.62 and 209.16

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Solution

The fourth proportional to 440.50, 660.62 and 209.16 is: 313.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.50 : 660.62 = 209.16 : x
  2. Step 2: Convert to fraction form
    440.50/660.62 = 209.16/x
  3. Step 3: Cross multiply
    440.50x = 660.62 × 209.16
  4. Step 4: Simplify right side
    440.50x = 138,175.28
  5. Step 5: Solve for x
    x = 138,175.28/440.50
  6. Step 6: Final answer
    x = 313.68

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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.