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Finding the Fourth Proportional to 666.50, 919.78 and 371.77

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Solution

The fourth proportional to 666.50, 919.78 and 371.77 is: 513.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.50 : 919.78 = 371.77 : x
  2. Step 2: Convert to fraction form
    666.50/919.78 = 371.77/x
  3. Step 3: Cross multiply
    666.50x = 919.78 × 371.77
  4. Step 4: Simplify right side
    666.50x = 341,943.38
  5. Step 5: Solve for x
    x = 341,943.38/666.50
  6. Step 6: Final answer
    x = 513.04

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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.