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Finding the Fourth Proportional to 666.48, 919.73 and 371.80

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Solution

The fourth proportional to 666.48, 919.73 and 371.80 is: 513.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.48 : 919.73 = 371.80 : x
  2. Step 2: Convert to fraction form
    666.48/919.73 = 371.80/x
  3. Step 3: Cross multiply
    666.48x = 919.73 × 371.80
  4. Step 4: Simplify right side
    666.48x = 341,954.24
  5. Step 5: Solve for x
    x = 341,954.24/666.48
  6. Step 6: Final answer
    x = 513.08

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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.