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Finding the Fourth Proportional to 414.99, 621.72 and 209.07

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Solution

The fourth proportional to 414.99, 621.72 and 209.07 is: 313.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.99 : 621.72 = 209.07 : x
  2. Step 2: Convert to fraction form
    414.99/621.72 = 209.07/x
  3. Step 3: Cross multiply
    414.99x = 621.72 × 209.07
  4. Step 4: Simplify right side
    414.99x = 129,983.00
  5. Step 5: Solve for x
    x = 129,983.00/414.99
  6. Step 6: Final answer
    x = 313.22

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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.