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Finding the Fourth Proportional to 1,686.24, 2,529 and 515.98

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Solution

The fourth proportional to 1,686.24, 2,529 and 515.98 is: 773.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.24 : 2,529 = 515.98 : x
  2. Step 2: Convert to fraction form
    1,686.24/2,529 = 515.98/x
  3. Step 3: Cross multiply
    1,686.24x = 2,529 × 515.98
  4. Step 4: Simplify right side
    1,686.24x = 1,304,913.42
  5. Step 5: Solve for x
    x = 1,304,913.42/1,686.24
  6. Step 6: Final answer
    x = 773.86

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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.