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Finding the Fourth Proportional to 634.98, 876.72 and 399

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Solution

The fourth proportional to 634.98, 876.72 and 399 is: 550.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    634.98 : 876.72 = 399 : x
  2. Step 2: Convert to fraction form
    634.98/876.72 = 399/x
  3. Step 3: Cross multiply
    634.98x = 876.72 × 399
  4. Step 4: Simplify right side
    634.98x = 349,811.28
  5. Step 5: Solve for x
    x = 349,811.28/634.98
  6. Step 6: Final answer
    x = 550.90

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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.