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Finding the Fourth Proportional to 678.74, 1,018.22 and 216.63

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Solution

The fourth proportional to 678.74, 1,018.22 and 216.63 is: 324.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.74 : 1,018.22 = 216.63 : x
  2. Step 2: Convert to fraction form
    678.74/1,018.22 = 216.63/x
  3. Step 3: Cross multiply
    678.74x = 1,018.22 × 216.63
  4. Step 4: Simplify right side
    678.74x = 220,575.92
  5. Step 5: Solve for x
    x = 220,575.92/678.74
  6. Step 6: Final answer
    x = 324.98

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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.