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Finding the Fourth Proportional to 403.89, 557.28 and 238.04

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Solution

The fourth proportional to 403.89, 557.28 and 238.04 is: 328.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.89 : 557.28 = 238.04 : x
  2. Step 2: Convert to fraction form
    403.89/557.28 = 238.04/x
  3. Step 3: Cross multiply
    403.89x = 557.28 × 238.04
  4. Step 4: Simplify right side
    403.89x = 132,657.27
  5. Step 5: Solve for x
    x = 132,657.27/403.89
  6. Step 6: Final answer
    x = 328.45

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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.