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Finding the Fourth Proportional to 414.56, 621.38 and 209.32

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Solution

The fourth proportional to 414.56, 621.38 and 209.32 is: 313.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.56 : 621.38 = 209.32 : x
  2. Step 2: Convert to fraction form
    414.56/621.38 = 209.32/x
  3. Step 3: Cross multiply
    414.56x = 621.38 × 209.32
  4. Step 4: Simplify right side
    414.56x = 130,066.23
  5. Step 5: Solve for x
    x = 130,066.23/414.56
  6. Step 6: Final answer
    x = 313.74

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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.