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Finding the Fourth Proportional to 666.39, 919.59 and 371.65

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Solution

The fourth proportional to 666.39, 919.59 and 371.65 is: 512.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.39 : 919.59 = 371.65 : x
  2. Step 2: Convert to fraction form
    666.39/919.59 = 371.65/x
  3. Step 3: Cross multiply
    666.39x = 919.59 × 371.65
  4. Step 4: Simplify right side
    666.39x = 341,765.62
  5. Step 5: Solve for x
    x = 341,765.62/666.39
  6. Step 6: Final answer
    x = 512.86

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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.