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Finding the Fourth Proportional to 394.88, 545.52 and 336.80

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Solution

The fourth proportional to 394.88, 545.52 and 336.80 is: 465.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.88 : 545.52 = 336.80 : x
  2. Step 2: Convert to fraction form
    394.88/545.52 = 336.80/x
  3. Step 3: Cross multiply
    394.88x = 545.52 × 336.80
  4. Step 4: Simplify right side
    394.88x = 183,731.14
  5. Step 5: Solve for x
    x = 183,731.14/394.88
  6. Step 6: Final answer
    x = 465.28

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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.