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Finding the Fourth Proportional to 404.07, 557.16 and 279.81

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Solution

The fourth proportional to 404.07, 557.16 and 279.81 is: 385.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.07 : 557.16 = 279.81 : x
  2. Step 2: Convert to fraction form
    404.07/557.16 = 279.81/x
  3. Step 3: Cross multiply
    404.07x = 557.16 × 279.81
  4. Step 4: Simplify right side
    404.07x = 155,898.94
  5. Step 5: Solve for x
    x = 155,898.94/404.07
  6. Step 6: Final answer
    x = 385.82

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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.