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Finding the Fourth Proportional to 678.58, 1,017.87 and 216.30

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Solution

The fourth proportional to 678.58, 1,017.87 and 216.30 is: 324.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.58 : 1,017.87 = 216.30 : x
  2. Step 2: Convert to fraction form
    678.58/1,017.87 = 216.30/x
  3. Step 3: Cross multiply
    678.58x = 1,017.87 × 216.30
  4. Step 4: Simplify right side
    678.58x = 220,168.29
  5. Step 5: Solve for x
    x = 220,168.29/678.58
  6. Step 6: Final answer
    x = 324.46

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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.