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Finding the Fourth Proportional to 396.39, 545.33 and 317.25

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Solution

The fourth proportional to 396.39, 545.33 and 317.25 is: 436.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.39 : 545.33 = 317.25 : x
  2. Step 2: Convert to fraction form
    396.39/545.33 = 317.25/x
  3. Step 3: Cross multiply
    396.39x = 545.33 × 317.25
  4. Step 4: Simplify right side
    396.39x = 173,006.74
  5. Step 5: Solve for x
    x = 173,006.74/396.39
  6. Step 6: Final answer
    x = 436.45

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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.