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Finding the Fourth Proportional to 457.99, 687.42 and 252.79

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Solution

The fourth proportional to 457.99, 687.42 and 252.79 is: 379.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.99 : 687.42 = 252.79 : x
  2. Step 2: Convert to fraction form
    457.99/687.42 = 252.79/x
  3. Step 3: Cross multiply
    457.99x = 687.42 × 252.79
  4. Step 4: Simplify right side
    457.99x = 173,771.18
  5. Step 5: Solve for x
    x = 173,771.18/457.99
  6. Step 6: Final answer
    x = 379.42

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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.