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Finding the Fourth Proportional to 666.21, 919.38 and 371.49

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Solution

The fourth proportional to 666.21, 919.38 and 371.49 is: 512.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.21 : 919.38 = 371.49 : x
  2. Step 2: Convert to fraction form
    666.21/919.38 = 371.49/x
  3. Step 3: Cross multiply
    666.21x = 919.38 × 371.49
  4. Step 4: Simplify right side
    666.21x = 341,540.48
  5. Step 5: Solve for x
    x = 341,540.48/666.21
  6. Step 6: Final answer
    x = 512.66

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1.5x scale

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.