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Finding the Fourth Proportional to 403.82, 557.17 and 256.40

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Solution

The fourth proportional to 403.82, 557.17 and 256.40 is: 353.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.82 : 557.17 = 256.40 : x
  2. Step 2: Convert to fraction form
    403.82/557.17 = 256.40/x
  3. Step 3: Cross multiply
    403.82x = 557.17 × 256.40
  4. Step 4: Simplify right side
    403.82x = 142,858.39
  5. Step 5: Solve for x
    x = 142,858.39/403.82
  6. Step 6: Final answer
    x = 353.77

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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.