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Finding the Fourth Proportional to 686.97, 948.04 and 392.33

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Solution

The fourth proportional to 686.97, 948.04 and 392.33 is: 541.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.97 : 948.04 = 392.33 : x
  2. Step 2: Convert to fraction form
    686.97/948.04 = 392.33/x
  3. Step 3: Cross multiply
    686.97x = 948.04 × 392.33
  4. Step 4: Simplify right side
    686.97x = 371,939.79
  5. Step 5: Solve for x
    x = 371,939.79/686.97
  6. Step 6: Final answer
    x = 541.42

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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.