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Finding the Fourth Proportional to 686.53, 1,029.69 and 199.65

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Solution

The fourth proportional to 686.53, 1,029.69 and 199.65 is: 299.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.53 : 1,029.69 = 199.65 : x
  2. Step 2: Convert to fraction form
    686.53/1,029.69 = 199.65/x
  3. Step 3: Cross multiply
    686.53x = 1,029.69 × 199.65
  4. Step 4: Simplify right side
    686.53x = 205,577.61
  5. Step 5: Solve for x
    x = 205,577.61/686.53
  6. Step 6: Final answer
    x = 299.45

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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.