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Finding the Fourth Proportional to 447.99, 618.21 and 261.51

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Solution

The fourth proportional to 447.99, 618.21 and 261.51 is: 360.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.99 : 618.21 = 261.51 : x
  2. Step 2: Convert to fraction form
    447.99/618.21 = 261.51/x
  3. Step 3: Cross multiply
    447.99x = 618.21 × 261.51
  4. Step 4: Simplify right side
    447.99x = 161,668.10
  5. Step 5: Solve for x
    x = 161,668.10/447.99
  6. Step 6: Final answer
    x = 360.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.