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Finding the Fourth Proportional to 458, 687.18 and 226.88

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Solution

The fourth proportional to 458, 687.18 and 226.88 is: 340.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    458 : 687.18 = 226.88 : x
  2. Step 2: Convert to fraction form
    458/687.18 = 226.88/x
  3. Step 3: Cross multiply
    458x = 687.18 × 226.88
  4. Step 4: Simplify right side
    458x = 155,907.40
  5. Step 5: Solve for x
    x = 155,907.40/458
  6. Step 6: Final answer
    x = 340.41

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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.