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Finding the Fourth Proportional to 403.18, 556.18 and 328.61

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Solution

The fourth proportional to 403.18, 556.18 and 328.61 is: 453.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.18 : 556.18 = 328.61 : x
  2. Step 2: Convert to fraction form
    403.18/556.18 = 328.61/x
  3. Step 3: Cross multiply
    403.18x = 556.18 × 328.61
  4. Step 4: Simplify right side
    403.18x = 182,766.31
  5. Step 5: Solve for x
    x = 182,766.31/403.18
  6. Step 6: Final answer
    x = 453.31

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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.