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Finding the Fourth Proportional to 442.72, 660.95 and 381.82

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Solution

The fourth proportional to 442.72, 660.95 and 381.82 is: 570.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.72 : 660.95 = 381.82 : x
  2. Step 2: Convert to fraction form
    442.72/660.95 = 381.82/x
  3. Step 3: Cross multiply
    442.72x = 660.95 × 381.82
  4. Step 4: Simplify right side
    442.72x = 252,363.93
  5. Step 5: Solve for x
    x = 252,363.93/442.72
  6. Step 6: Final answer
    x = 570.03

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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.