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Finding the Fourth Proportional to 403.86, 557.42 and 238.20

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Solution

The fourth proportional to 403.86, 557.42 and 238.20 is: 328.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.86 : 557.42 = 238.20 : x
  2. Step 2: Convert to fraction form
    403.86/557.42 = 238.20/x
  3. Step 3: Cross multiply
    403.86x = 557.42 × 238.20
  4. Step 4: Simplify right side
    403.86x = 132,776.25
  5. Step 5: Solve for x
    x = 132,776.25/403.86
  6. Step 6: Final answer
    x = 328.77

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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.