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Finding the Fourth Proportional to 440.70, 661.22 and 209.64

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Solution

The fourth proportional to 440.70, 661.22 and 209.64 is: 314.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.70 : 661.22 = 209.64 : x
  2. Step 2: Convert to fraction form
    440.70/661.22 = 209.64/x
  3. Step 3: Cross multiply
    440.70x = 661.22 × 209.64
  4. Step 4: Simplify right side
    440.70x = 138,617.11
  5. Step 5: Solve for x
    x = 138,617.11/440.70
  6. Step 6: Final answer
    x = 314.54

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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.