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Finding the Fourth Proportional to 666.53, 919.81 and 371.80

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Solution

The fourth proportional to 666.53, 919.81 and 371.80 is: 513.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.53 : 919.81 = 371.80 : x
  2. Step 2: Convert to fraction form
    666.53/919.81 = 371.80/x
  3. Step 3: Cross multiply
    666.53x = 919.81 × 371.80
  4. Step 4: Simplify right side
    666.53x = 341,984.32
  5. Step 5: Solve for x
    x = 341,984.32/666.53
  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.