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Finding the Fourth Proportional to 458.71, 687.70 and 285.42

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Solution

The fourth proportional to 458.71, 687.70 and 285.42 is: 427.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.71 : 687.70 = 285.42 : x
  2. Step 2: Convert to fraction form
    458.71/687.70 = 285.42/x
  3. Step 3: Cross multiply
    458.71x = 687.70 × 285.42
  4. Step 4: Simplify right side
    458.71x = 196,283.33
  5. Step 5: Solve for x
    x = 196,283.33/458.71
  6. Step 6: Final answer
    x = 427.90

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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.