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Finding the Fourth Proportional to 686.97, 947.97 and 376.47

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Solution

The fourth proportional to 686.97, 947.97 and 376.47 is: 519.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.97 : 947.97 = 376.47 : x
  2. Step 2: Convert to fraction form
    686.97/947.97 = 376.47/x
  3. Step 3: Cross multiply
    686.97x = 947.97 × 376.47
  4. Step 4: Simplify right side
    686.97x = 356,882.27
  5. Step 5: Solve for x
    x = 356,882.27/686.97
  6. Step 6: Final answer
    x = 519.50

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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.