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Finding the Fourth Proportional to 686.53, 947.28 and 391.78

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Solution

The fourth proportional to 686.53, 947.28 and 391.78 is: 540.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.53 : 947.28 = 391.78 : x
  2. Step 2: Convert to fraction form
    686.53/947.28 = 391.78/x
  3. Step 3: Cross multiply
    686.53x = 947.28 × 391.78
  4. Step 4: Simplify right side
    686.53x = 371,125.36
  5. Step 5: Solve for x
    x = 371,125.36/686.53
  6. Step 6: Final answer
    x = 540.58

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.