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Finding the Fourth Proportional to 629.81, 868.95 and 498.41

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Solution

The fourth proportional to 629.81, 868.95 and 498.41 is: 687.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.81 : 868.95 = 498.41 : x
  2. Step 2: Convert to fraction form
    629.81/868.95 = 498.41/x
  3. Step 3: Cross multiply
    629.81x = 868.95 × 498.41
  4. Step 4: Simplify right side
    629.81x = 433,093.37
  5. Step 5: Solve for x
    x = 433,093.37/629.81
  6. Step 6: Final answer
    x = 687.66

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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.