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Finding the Fourth Proportional to 666.62, 919.99 and 371.85

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Solution

The fourth proportional to 666.62, 919.99 and 371.85 is: 513.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.62 : 919.99 = 371.85 : x
  2. Step 2: Convert to fraction form
    666.62/919.99 = 371.85/x
  3. Step 3: Cross multiply
    666.62x = 919.99 × 371.85
  4. Step 4: Simplify right side
    666.62x = 342,098.28
  5. Step 5: Solve for x
    x = 342,098.28/666.62
  6. Step 6: Final answer
    x = 513.18

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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.