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Finding the Fourth Proportional to 686.36, 947.22 and 375.86

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Solution

The fourth proportional to 686.36, 947.22 and 375.86 is: 518.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.36 : 947.22 = 375.86 : x
  2. Step 2: Convert to fraction form
    686.36/947.22 = 375.86/x
  3. Step 3: Cross multiply
    686.36x = 947.22 × 375.86
  4. Step 4: Simplify right side
    686.36x = 356,022.11
  5. Step 5: Solve for x
    x = 356,022.11/686.36
  6. Step 6: Final answer
    x = 518.71

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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.