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Finding the Fourth Proportional to 666.73, 919.94 and 386.92

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Solution

The fourth proportional to 666.73, 919.94 and 386.92 is: 533.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.73 : 919.94 = 386.92 : x
  2. Step 2: Convert to fraction form
    666.73/919.94 = 386.92/x
  3. Step 3: Cross multiply
    666.73x = 919.94 × 386.92
  4. Step 4: Simplify right side
    666.73x = 355,945.58
  5. Step 5: Solve for x
    x = 355,945.58/666.73
  6. Step 6: Final answer
    x = 533.87

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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.