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Finding the Fourth Proportional to 666.20, 919.34 and 371.50

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Solution

The fourth proportional to 666.20, 919.34 and 371.50 is: 512.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.20 : 919.34 = 371.50 : x
  2. Step 2: Convert to fraction form
    666.20/919.34 = 371.50/x
  3. Step 3: Cross multiply
    666.20x = 919.34 × 371.50
  4. Step 4: Simplify right side
    666.20x = 341,534.81
  5. Step 5: Solve for x
    x = 341,534.81/666.20
  6. Step 6: Final answer
    x = 512.66

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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.