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Finding the Fourth Proportional to 636.98, 879 and 413

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Solution

The fourth proportional to 636.98, 879 and 413 is: 569.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.98 : 879 = 413 : x
  2. Step 2: Convert to fraction form
    636.98/879 = 413/x
  3. Step 3: Cross multiply
    636.98x = 879 × 413
  4. Step 4: Simplify right side
    636.98x = 363,027
  5. Step 5: Solve for x
    x = 363,027/636.98
  6. Step 6: Final answer
    x = 569.92

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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.