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Finding the Fourth Proportional to 678.61, 1,017.17 and 331.55

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Solution

The fourth proportional to 678.61, 1,017.17 and 331.55 is: 496.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.61 : 1,017.17 = 331.55 : x
  2. Step 2: Convert to fraction form
    678.61/1,017.17 = 331.55/x
  3. Step 3: Cross multiply
    678.61x = 1,017.17 × 331.55
  4. Step 4: Simplify right side
    678.61x = 337,242.71
  5. Step 5: Solve for x
    x = 337,242.71/678.61
  6. Step 6: Final answer
    x = 496.96

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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.