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Finding the Fourth Proportional to 403.82, 557.19 and 279.44

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Solution

The fourth proportional to 403.82, 557.19 and 279.44 is: 385.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.82 : 557.19 = 279.44 : x
  2. Step 2: Convert to fraction form
    403.82/557.19 = 279.44/x
  3. Step 3: Cross multiply
    403.82x = 557.19 × 279.44
  4. Step 4: Simplify right side
    403.82x = 155,700.48
  5. Step 5: Solve for x
    x = 155,700.48/403.82
  6. Step 6: Final answer
    x = 385.57

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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.