Home / 20,371.08-28,107.90-12,399.48

Finding the Fourth Proportional to 20,371.08, 28,107.90 and 12,399.48

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Solution

The fourth proportional to 20,371.08, 28,107.90 and 12,399.48 is: 17,108.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,371.08 : 28,107.90 = 12,399.48 : x
  2. Step 2: Convert to fraction form
    20,371.08/28,107.90 = 12,399.48/x
  3. Step 3: Cross multiply
    20,371.08x = 28,107.90 × 12,399.48
  4. Step 4: Simplify right side
    20,371.08x = 348,523,343.89
  5. Step 5: Solve for x
    x = 348,523,343.89/20,371.08
  6. Step 6: Final answer
    x = 17,108.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.