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Finding the Fourth Proportional to 666.64, 919.88 and 371.91

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Solution

The fourth proportional to 666.64, 919.88 and 371.91 is: 513.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.64 : 919.88 = 371.91 : x
  2. Step 2: Convert to fraction form
    666.64/919.88 = 371.91/x
  3. Step 3: Cross multiply
    666.64x = 919.88 × 371.91
  4. Step 4: Simplify right side
    666.64x = 342,112.57
  5. Step 5: Solve for x
    x = 342,112.57/666.64
  6. Step 6: Final answer
    x = 513.19

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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.