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Finding the Fourth Proportional to 396.65, 545.75 and 387.44

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Solution

The fourth proportional to 396.65, 545.75 and 387.44 is: 533.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.65 : 545.75 = 387.44 : x
  2. Step 2: Convert to fraction form
    396.65/545.75 = 387.44/x
  3. Step 3: Cross multiply
    396.65x = 545.75 × 387.44
  4. Step 4: Simplify right side
    396.65x = 211,440.71
  5. Step 5: Solve for x
    x = 211,440.71/396.65
  6. Step 6: Final answer
    x = 533.07

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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.