Home / 1,687.56-2,531.34-517.57

Finding the Fourth Proportional to 1,687.56, 2,531.34 and 517.57

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Solution

The fourth proportional to 1,687.56, 2,531.34 and 517.57 is: 776.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.56 : 2,531.34 = 517.57 : x
  2. Step 2: Convert to fraction form
    1,687.56/2,531.34 = 517.57/x
  3. Step 3: Cross multiply
    1,687.56x = 2,531.34 × 517.57
  4. Step 4: Simplify right side
    1,687.56x = 1,310,140.61
  5. Step 5: Solve for x
    x = 1,310,140.61/1,687.56
  6. Step 6: Final answer
    x = 776.35

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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.