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Finding the Fourth Proportional to 403.90, 557.21 and 256.48

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Solution

The fourth proportional to 403.90, 557.21 and 256.48 is: 353.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.90 : 557.21 = 256.48 : x
  2. Step 2: Convert to fraction form
    403.90/557.21 = 256.48/x
  3. Step 3: Cross multiply
    403.90x = 557.21 × 256.48
  4. Step 4: Simplify right side
    403.90x = 142,912.47
  5. Step 5: Solve for x
    x = 142,912.47/403.90
  6. Step 6: Final answer
    x = 353.83

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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.