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Finding the Fourth Proportional to 629.99, 868.91 and 559.18

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Solution

The fourth proportional to 629.99, 868.91 and 559.18 is: 771.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.99 : 868.91 = 559.18 : x
  2. Step 2: Convert to fraction form
    629.99/868.91 = 559.18/x
  3. Step 3: Cross multiply
    629.99x = 868.91 × 559.18
  4. Step 4: Simplify right side
    629.99x = 485,873.64
  5. Step 5: Solve for x
    x = 485,873.64/629.99
  6. Step 6: Final answer
    x = 771.23

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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.