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Finding the Fourth Proportional to 395.41, 545.13 and 328.76

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Solution

The fourth proportional to 395.41, 545.13 and 328.76 is: 453.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.41 : 545.13 = 328.76 : x
  2. Step 2: Convert to fraction form
    395.41/545.13 = 328.76/x
  3. Step 3: Cross multiply
    395.41x = 545.13 × 328.76
  4. Step 4: Simplify right side
    395.41x = 179,216.94
  5. Step 5: Solve for x
    x = 179,216.94/395.41
  6. Step 6: Final answer
    x = 453.25

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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.