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Finding the Fourth Proportional to 457.38, 685.26 and 447.66

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Solution

The fourth proportional to 457.38, 685.26 and 447.66 is: 670.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.38 : 685.26 = 447.66 : x
  2. Step 2: Convert to fraction form
    457.38/685.26 = 447.66/x
  3. Step 3: Cross multiply
    457.38x = 685.26 × 447.66
  4. Step 4: Simplify right side
    457.38x = 306,763.49
  5. Step 5: Solve for x
    x = 306,763.49/457.38
  6. Step 6: Final answer
    x = 670.70

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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.