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Finding the Fourth Proportional to 686.49, 1,029.95 and 199.55

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Solution

The fourth proportional to 686.49, 1,029.95 and 199.55 is: 299.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.49 : 1,029.95 = 199.55 : x
  2. Step 2: Convert to fraction form
    686.49/1,029.95 = 199.55/x
  3. Step 3: Cross multiply
    686.49x = 1,029.95 × 199.55
  4. Step 4: Simplify right side
    686.49x = 205,520.38
  5. Step 5: Solve for x
    x = 205,520.38/686.49
  6. Step 6: Final answer
    x = 299.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.