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Finding the Fourth Proportional to 686.95, 947.99 and 372.22

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Solution

The fourth proportional to 686.95, 947.99 and 372.22 is: 513.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.95 : 947.99 = 372.22 : x
  2. Step 2: Convert to fraction form
    686.95/947.99 = 372.22/x
  3. Step 3: Cross multiply
    686.95x = 947.99 × 372.22
  4. Step 4: Simplify right side
    686.95x = 352,857.30
  5. Step 5: Solve for x
    x = 352,857.30/686.95
  6. Step 6: Final answer
    x = 513.66

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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.