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Finding the Fourth Proportional to 686.73, 947.51 and 391.94

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Solution

The fourth proportional to 686.73, 947.51 and 391.94 is: 540.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.73 : 947.51 = 391.94 : x
  2. Step 2: Convert to fraction form
    686.73/947.51 = 391.94/x
  3. Step 3: Cross multiply
    686.73x = 947.51 × 391.94
  4. Step 4: Simplify right side
    686.73x = 371,365.11
  5. Step 5: Solve for x
    x = 371,365.11/686.73
  6. Step 6: Final answer
    x = 540.77

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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.