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Finding the Fourth Proportional to 403.94, 557.70 and 279.56

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Solution

The fourth proportional to 403.94, 557.70 and 279.56 is: 385.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.94 : 557.70 = 279.56 : x
  2. Step 2: Convert to fraction form
    403.94/557.70 = 279.56/x
  3. Step 3: Cross multiply
    403.94x = 557.70 × 279.56
  4. Step 4: Simplify right side
    403.94x = 155,910.61
  5. Step 5: Solve for x
    x = 155,910.61/403.94
  6. Step 6: Final answer
    x = 385.97

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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.