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Finding the Fourth Proportional to 629.93, 872.97 and 621.11

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Solution

The fourth proportional to 629.93, 872.97 and 621.11 is: 860.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.93 : 872.97 = 621.11 : x
  2. Step 2: Convert to fraction form
    629.93/872.97 = 621.11/x
  3. Step 3: Cross multiply
    629.93x = 872.97 × 621.11
  4. Step 4: Simplify right side
    629.93x = 542,207.29
  5. Step 5: Solve for x
    x = 542,207.29/629.93
  6. Step 6: Final answer
    x = 860.75

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.