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Finding the Fourth Proportional to 458.37, 687.90 and 285.29

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Solution

The fourth proportional to 458.37, 687.90 and 285.29 is: 428.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.37 : 687.90 = 285.29 : x
  2. Step 2: Convert to fraction form
    458.37/687.90 = 285.29/x
  3. Step 3: Cross multiply
    458.37x = 687.90 × 285.29
  4. Step 4: Simplify right side
    458.37x = 196,249.60
  5. Step 5: Solve for x
    x = 196,249.60/458.37
  6. Step 6: Final answer
    x = 428.15

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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.