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Finding the Fourth Proportional to 403.48, 557.04 and 256.33

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Solution

The fourth proportional to 403.48, 557.04 and 256.33 is: 353.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.48 : 557.04 = 256.33 : x
  2. Step 2: Convert to fraction form
    403.48/557.04 = 256.33/x
  3. Step 3: Cross multiply
    403.48x = 557.04 × 256.33
  4. Step 4: Simplify right side
    403.48x = 142,786.06
  5. Step 5: Solve for x
    x = 142,786.06/403.48
  6. Step 6: Final answer
    x = 353.89

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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.