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Finding the Fourth Proportional to 404.22, 557.10 and 279.66

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Solution

The fourth proportional to 404.22, 557.10 and 279.66 is: 385.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.22 : 557.10 = 279.66 : x
  2. Step 2: Convert to fraction form
    404.22/557.10 = 279.66/x
  3. Step 3: Cross multiply
    404.22x = 557.10 × 279.66
  4. Step 4: Simplify right side
    404.22x = 155,798.59
  5. Step 5: Solve for x
    x = 155,798.59/404.22
  6. Step 6: Final answer
    x = 385.43

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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.