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Finding the Fourth Proportional to 457.28, 629.17 and 394.91

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Solution

The fourth proportional to 457.28, 629.17 and 394.91 is: 543.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.28 : 629.17 = 394.91 : x
  2. Step 2: Convert to fraction form
    457.28/629.17 = 394.91/x
  3. Step 3: Cross multiply
    457.28x = 629.17 × 394.91
  4. Step 4: Simplify right side
    457.28x = 248,463.75
  5. Step 5: Solve for x
    x = 248,463.75/457.28
  6. Step 6: Final answer
    x = 543.35

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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.