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Finding the Fourth Proportional to 403.71, 557.46 and 321.27

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Solution

The fourth proportional to 403.71, 557.46 and 321.27 is: 443.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.71 : 557.46 = 321.27 : x
  2. Step 2: Convert to fraction form
    403.71/557.46 = 321.27/x
  3. Step 3: Cross multiply
    403.71x = 557.46 × 321.27
  4. Step 4: Simplify right side
    403.71x = 179,095.17
  5. Step 5: Solve for x
    x = 179,095.17/403.71
  6. Step 6: Final answer
    x = 443.62

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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.