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Finding the Fourth Proportional to 678.63, 1,017.91 and 216.43

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Solution

The fourth proportional to 678.63, 1,017.91 and 216.43 is: 324.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.63 : 1,017.91 = 216.43 : x
  2. Step 2: Convert to fraction form
    678.63/1,017.91 = 216.43/x
  3. Step 3: Cross multiply
    678.63x = 1,017.91 × 216.43
  4. Step 4: Simplify right side
    678.63x = 220,306.26
  5. Step 5: Solve for x
    x = 220,306.26/678.63
  6. Step 6: Final answer
    x = 324.63

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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.