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Finding the Fourth Proportional to 627.80, 866.16 and 379.20

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Solution

The fourth proportional to 627.80, 866.16 and 379.20 is: 523.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.80 : 866.16 = 379.20 : x
  2. Step 2: Convert to fraction form
    627.80/866.16 = 379.20/x
  3. Step 3: Cross multiply
    627.80x = 866.16 × 379.20
  4. Step 4: Simplify right side
    627.80x = 328,447.87
  5. Step 5: Solve for x
    x = 328,447.87/627.80
  6. Step 6: Final answer
    x = 523.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.