Home / 12,757.72-19,129.38-3,990.28

Finding the Fourth Proportional to 12,757.72, 19,129.38 and 3,990.28

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Solution

The fourth proportional to 12,757.72, 19,129.38 and 3,990.28 is: 5,983.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,757.72 : 19,129.38 = 3,990.28 : x
  2. Step 2: Convert to fraction form
    12,757.72/19,129.38 = 3,990.28/x
  3. Step 3: Cross multiply
    12,757.72x = 19,129.38 × 3,990.28
  4. Step 4: Simplify right side
    12,757.72x = 76,331,582.43
  5. Step 5: Solve for x
    x = 76,331,582.43/12,757.72
  6. Step 6: Final answer
    x = 5,983.17

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1.5x scale

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.