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Finding the Fourth Proportional to 629.91, 872.64 and 614.79

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Solution

The fourth proportional to 629.91, 872.64 and 614.79 is: 851.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.91 : 872.64 = 614.79 : x
  2. Step 2: Convert to fraction form
    629.91/872.64 = 614.79/x
  3. Step 3: Cross multiply
    629.91x = 872.64 × 614.79
  4. Step 4: Simplify right side
    629.91x = 536,490.35
  5. Step 5: Solve for x
    x = 536,490.35/629.91
  6. Step 6: Final answer
    x = 851.69

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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.