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Finding the Fourth Proportional to 458.82, 686.94 and 285

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Solution

The fourth proportional to 458.82, 686.94 and 285 is: 426.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.82 : 686.94 = 285 : x
  2. Step 2: Convert to fraction form
    458.82/686.94 = 285/x
  3. Step 3: Cross multiply
    458.82x = 686.94 × 285
  4. Step 4: Simplify right side
    458.82x = 195,777.90
  5. Step 5: Solve for x
    x = 195,777.90/458.82
  6. Step 6: Final answer
    x = 426.70

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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.