Home / 3,989.40-5,983.32-1,356.72

Finding the Fourth Proportional to 3,989.40, 5,983.32 and 1,356.72

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Solution

The fourth proportional to 3,989.40, 5,983.32 and 1,356.72 is: 2,034.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.40 : 5,983.32 = 1,356.72 : x
  2. Step 2: Convert to fraction form
    3,989.40/5,983.32 = 1,356.72/x
  3. Step 3: Cross multiply
    3,989.40x = 5,983.32 × 1,356.72
  4. Step 4: Simplify right side
    3,989.40x = 8,117,689.91
  5. Step 5: Solve for x
    x = 8,117,689.91/3,989.40
  6. Step 6: Final answer
    x = 2,034.81

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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.