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Finding the Fourth Proportional to 458.18, 687.49 and 284.80

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Solution

The fourth proportional to 458.18, 687.49 and 284.80 is: 427.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.18 : 687.49 = 284.80 : x
  2. Step 2: Convert to fraction form
    458.18/687.49 = 284.80/x
  3. Step 3: Cross multiply
    458.18x = 687.49 × 284.80
  4. Step 4: Simplify right side
    458.18x = 195,797.15
  5. Step 5: Solve for x
    x = 195,797.15/458.18
  6. Step 6: Final answer
    x = 427.34

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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.