Home / 1,686.45-2,531.30-821.37

Finding the Fourth Proportional to 1,686.45, 2,531.30 and 821.37

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Solution

The fourth proportional to 1,686.45, 2,531.30 and 821.37 is: 1,232.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.45 : 2,531.30 = 821.37 : x
  2. Step 2: Convert to fraction form
    1,686.45/2,531.30 = 821.37/x
  3. Step 3: Cross multiply
    1,686.45x = 2,531.30 × 821.37
  4. Step 4: Simplify right side
    1,686.45x = 2,079,143.89
  5. Step 5: Solve for x
    x = 2,079,143.89/1,686.45
  6. Step 6: Final answer
    x = 1,232.85

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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.