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Finding the Fourth Proportional to 404.15, 557.81 and 256.75

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Solution

The fourth proportional to 404.15, 557.81 and 256.75 is: 354.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.15 : 557.81 = 256.75 : x
  2. Step 2: Convert to fraction form
    404.15/557.81 = 256.75/x
  3. Step 3: Cross multiply
    404.15x = 557.81 × 256.75
  4. Step 4: Simplify right side
    404.15x = 143,215.04
  5. Step 5: Solve for x
    x = 143,215.04/404.15
  6. Step 6: Final answer
    x = 354.37

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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.