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Finding the Fourth Proportional to 629.76, 861.59 and 627.03

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Solution

The fourth proportional to 629.76, 861.59 and 627.03 is: 857.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.76 : 861.59 = 627.03 : x
  2. Step 2: Convert to fraction form
    629.76/861.59 = 627.03/x
  3. Step 3: Cross multiply
    629.76x = 861.59 × 627.03
  4. Step 4: Simplify right side
    629.76x = 540,242.78
  5. Step 5: Solve for x
    x = 540,242.78/629.76
  6. Step 6: Final answer
    x = 857.86

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.