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Finding the Fourth Proportional to 687.16, 1,029.66 and 398.44

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Solution

The fourth proportional to 687.16, 1,029.66 and 398.44 is: 597.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.16 : 1,029.66 = 398.44 : x
  2. Step 2: Convert to fraction form
    687.16/1,029.66 = 398.44/x
  3. Step 3: Cross multiply
    687.16x = 1,029.66 × 398.44
  4. Step 4: Simplify right side
    687.16x = 410,257.73
  5. Step 5: Solve for x
    x = 410,257.73/687.16
  6. Step 6: Final answer
    x = 597.03

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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.