Home / 20,787.40-31,185.15-8,305.30

Finding the Fourth Proportional to 20,787.40, 31,185.15 and 8,305.30

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Solution

The fourth proportional to 20,787.40, 31,185.15 and 8,305.30 is: 12,459.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.40 : 31,185.15 = 8,305.30 : x
  2. Step 2: Convert to fraction form
    20,787.40/31,185.15 = 8,305.30/x
  3. Step 3: Cross multiply
    20,787.40x = 31,185.15 × 8,305.30
  4. Step 4: Simplify right side
    20,787.40x = 259,002,026.30
  5. Step 5: Solve for x
    x = 259,002,026.30/20,787.40
  6. Step 6: Final answer
    x = 12,459.57

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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.