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Finding the Fourth Proportional to 441.31, 661.43 and 209.70

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Solution

The fourth proportional to 441.31, 661.43 and 209.70 is: 314.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    441.31 : 661.43 = 209.70 : x
  2. Step 2: Convert to fraction form
    441.31/661.43 = 209.70/x
  3. Step 3: Cross multiply
    441.31x = 661.43 × 209.70
  4. Step 4: Simplify right side
    441.31x = 138,700.82
  5. Step 5: Solve for x
    x = 138,700.82/441.31
  6. Step 6: Final answer
    x = 314.30

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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.