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Finding the Fourth Proportional to 553.11, 829.85 and 279.13

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Solution

The fourth proportional to 553.11, 829.85 and 279.13 is: 418.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.11 : 829.85 = 279.13 : x
  2. Step 2: Convert to fraction form
    553.11/829.85 = 279.13/x
  3. Step 3: Cross multiply
    553.11x = 829.85 × 279.13
  4. Step 4: Simplify right side
    553.11x = 231,636.03
  5. Step 5: Solve for x
    x = 231,636.03/553.11
  6. Step 6: Final answer
    x = 418.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.