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Finding the Fourth Proportional to 457.77, 687.25 and 393.19

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Solution

The fourth proportional to 457.77, 687.25 and 393.19 is: 590.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.77 : 687.25 = 393.19 : x
  2. Step 2: Convert to fraction form
    457.77/687.25 = 393.19/x
  3. Step 3: Cross multiply
    457.77x = 687.25 × 393.19
  4. Step 4: Simplify right side
    457.77x = 270,214.43
  5. Step 5: Solve for x
    x = 270,214.43/457.77
  6. Step 6: Final answer
    x = 590.28

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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.