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Finding the Fourth Proportional to 445, 666.78 and 396.52

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Solution

The fourth proportional to 445, 666.78 and 396.52 is: 594.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    445 : 666.78 = 396.52 : x
  2. Step 2: Convert to fraction form
    445/666.78 = 396.52/x
  3. Step 3: Cross multiply
    445x = 666.78 × 396.52
  4. Step 4: Simplify right side
    445x = 264,391.61
  5. Step 5: Solve for x
    x = 264,391.61/445
  6. Step 6: Final answer
    x = 594.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.