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Finding the Fourth Proportional to 678.44, 1,017.59 and 216.14

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Solution

The fourth proportional to 678.44, 1,017.59 and 216.14 is: 324.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.44 : 1,017.59 = 216.14 : x
  2. Step 2: Convert to fraction form
    678.44/1,017.59 = 216.14/x
  3. Step 3: Cross multiply
    678.44x = 1,017.59 × 216.14
  4. Step 4: Simplify right side
    678.44x = 219,935.73
  5. Step 5: Solve for x
    x = 219,935.73/678.44
  6. Step 6: Final answer
    x = 324.18

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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.