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Finding the Fourth Proportional to 666.33, 919.58 and 371.65

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Solution

The fourth proportional to 666.33, 919.58 and 371.65 is: 512.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.33 : 919.58 = 371.65 : x
  2. Step 2: Convert to fraction form
    666.33/919.58 = 371.65/x
  3. Step 3: Cross multiply
    666.33x = 919.58 × 371.65
  4. Step 4: Simplify right side
    666.33x = 341,760.05
  5. Step 5: Solve for x
    x = 341,760.05/666.33
  6. Step 6: Final answer
    x = 512.90

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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.