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Finding the Fourth Proportional to 457.62, 685.89 and 320.46

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Solution

The fourth proportional to 457.62, 685.89 and 320.46 is: 480.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.62 : 685.89 = 320.46 : x
  2. Step 2: Convert to fraction form
    457.62/685.89 = 320.46/x
  3. Step 3: Cross multiply
    457.62x = 685.89 × 320.46
  4. Step 4: Simplify right side
    457.62x = 219,800.31
  5. Step 5: Solve for x
    x = 219,800.31/457.62
  6. Step 6: Final answer
    x = 480.31

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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.