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Finding the Fourth Proportional to 678.41, 1,017.72 and 216.08

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Solution

The fourth proportional to 678.41, 1,017.72 and 216.08 is: 324.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.41 : 1,017.72 = 216.08 : x
  2. Step 2: Convert to fraction form
    678.41/1,017.72 = 216.08/x
  3. Step 3: Cross multiply
    678.41x = 1,017.72 × 216.08
  4. Step 4: Simplify right side
    678.41x = 219,908.94
  5. Step 5: Solve for x
    x = 219,908.94/678.41
  6. Step 6: Final answer
    x = 324.15

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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.