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Finding the Fourth Proportional to 458.82, 686.76 and 321.45

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Solution

The fourth proportional to 458.82, 686.76 and 321.45 is: 481.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.82 : 686.76 = 321.45 : x
  2. Step 2: Convert to fraction form
    458.82/686.76 = 321.45/x
  3. Step 3: Cross multiply
    458.82x = 686.76 × 321.45
  4. Step 4: Simplify right side
    458.82x = 220,759.00
  5. Step 5: Solve for x
    x = 220,759.00/458.82
  6. Step 6: Final answer
    x = 481.15

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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.