Home / 20,487.15-30,725.10-12,979.44

Finding the Fourth Proportional to 20,487.15, 30,725.10 and 12,979.44

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Solution

The fourth proportional to 20,487.15, 30,725.10 and 12,979.44 is: 19,465.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,487.15 : 30,725.10 = 12,979.44 : x
  2. Step 2: Convert to fraction form
    20,487.15/30,725.10 = 12,979.44/x
  3. Step 3: Cross multiply
    20,487.15x = 30,725.10 × 12,979.44
  4. Step 4: Simplify right side
    20,487.15x = 398,794,591.94
  5. Step 5: Solve for x
    x = 398,794,591.94/20,487.15
  6. Step 6: Final answer
    x = 19,465.60

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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.