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Finding the Fourth Proportional to 445.97, 665.74 and 385.13

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Solution

The fourth proportional to 445.97, 665.74 and 385.13 is: 574.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.97 : 665.74 = 385.13 : x
  2. Step 2: Convert to fraction form
    445.97/665.74 = 385.13/x
  3. Step 3: Cross multiply
    445.97x = 665.74 × 385.13
  4. Step 4: Simplify right side
    445.97x = 256,396.45
  5. Step 5: Solve for x
    x = 256,396.45/445.97
  6. Step 6: Final answer
    x = 574.92

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.