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Finding the Fourth Proportional to 627.70, 864.29 and 557.64

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Solution

The fourth proportional to 627.70, 864.29 and 557.64 is: 767.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.70 : 864.29 = 557.64 : x
  2. Step 2: Convert to fraction form
    627.70/864.29 = 557.64/x
  3. Step 3: Cross multiply
    627.70x = 864.29 × 557.64
  4. Step 4: Simplify right side
    627.70x = 481,958.35
  5. Step 5: Solve for x
    x = 481,958.35/627.70
  6. Step 6: Final answer
    x = 767.82

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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.