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Finding the Fourth Proportional to 414.60, 621.42 and 209.31

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Solution

The fourth proportional to 414.60, 621.42 and 209.31 is: 313.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.60 : 621.42 = 209.31 : x
  2. Step 2: Convert to fraction form
    414.60/621.42 = 209.31/x
  3. Step 3: Cross multiply
    414.60x = 621.42 × 209.31
  4. Step 4: Simplify right side
    414.60x = 130,069.42
  5. Step 5: Solve for x
    x = 130,069.42/414.60
  6. Step 6: Final answer
    x = 313.72

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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.