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Finding the Fourth Proportional to 629.90, 868.78 and 559.08

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Solution

The fourth proportional to 629.90, 868.78 and 559.08 is: 771.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.90 : 868.78 = 559.08 : x
  2. Step 2: Convert to fraction form
    629.90/868.78 = 559.08/x
  3. Step 3: Cross multiply
    629.90x = 868.78 × 559.08
  4. Step 4: Simplify right side
    629.90x = 485,718.22
  5. Step 5: Solve for x
    x = 485,718.22/629.90
  6. Step 6: Final answer
    x = 771.10

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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.