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Finding the Fourth Proportional to 457.56, 686.04 and 320.68

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Solution

The fourth proportional to 457.56, 686.04 and 320.68 is: 480.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.56 : 686.04 = 320.68 : x
  2. Step 2: Convert to fraction form
    457.56/686.04 = 320.68/x
  3. Step 3: Cross multiply
    457.56x = 686.04 × 320.68
  4. Step 4: Simplify right side
    457.56x = 219,999.31
  5. Step 5: Solve for x
    x = 219,999.31/457.56
  6. Step 6: Final answer
    x = 480.81

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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.