Home / 5,112.78-7,665.57-1,990.15

Finding the Fourth Proportional to 5,112.78, 7,665.57 and 1,990.15

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Solution

The fourth proportional to 5,112.78, 7,665.57 and 1,990.15 is: 2,983.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,112.78 : 7,665.57 = 1,990.15 : x
  2. Step 2: Convert to fraction form
    5,112.78/7,665.57 = 1,990.15/x
  3. Step 3: Cross multiply
    5,112.78x = 7,665.57 × 1,990.15
  4. Step 4: Simplify right side
    5,112.78x = 15,255,614.97
  5. Step 5: Solve for x
    x = 15,255,614.97/5,112.78
  6. Step 6: Final answer
    x = 2,983.82

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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.