Home / 7,989.28-11,983.88-2,145.40

Finding the Fourth Proportional to 7,989.28, 11,983.88 and 2,145.40

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Solution

The fourth proportional to 7,989.28, 11,983.88 and 2,145.40 is: 3,218.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,989.28 : 11,983.88 = 2,145.40 : x
  2. Step 2: Convert to fraction form
    7,989.28/11,983.88 = 2,145.40/x
  3. Step 3: Cross multiply
    7,989.28x = 11,983.88 × 2,145.40
  4. Step 4: Simplify right side
    7,989.28x = 25,710,216.15
  5. Step 5: Solve for x
    x = 25,710,216.15/7,989.28
  6. Step 6: Final answer
    x = 3,218.09

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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.