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Finding the Fourth Proportional to 404.12, 557.87 and 315.38

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Solution

The fourth proportional to 404.12, 557.87 and 315.38 is: 435.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.12 : 557.87 = 315.38 : x
  2. Step 2: Convert to fraction form
    404.12/557.87 = 315.38/x
  3. Step 3: Cross multiply
    404.12x = 557.87 × 315.38
  4. Step 4: Simplify right side
    404.12x = 175,940.86
  5. Step 5: Solve for x
    x = 175,940.86/404.12
  6. Step 6: Final answer
    x = 435.37

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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.