Home / 7,988.40-11,981.52-2,145.36

Finding the Fourth Proportional to 7,988.40, 11,981.52 and 2,145.36

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Solution

The fourth proportional to 7,988.40, 11,981.52 and 2,145.36 is: 3,217.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,988.40 : 11,981.52 = 2,145.36 : x
  2. Step 2: Convert to fraction form
    7,988.40/11,981.52 = 2,145.36/x
  3. Step 3: Cross multiply
    7,988.40x = 11,981.52 × 2,145.36
  4. Step 4: Simplify right side
    7,988.40x = 25,704,673.75
  5. Step 5: Solve for x
    x = 25,704,673.75/7,988.40
  6. Step 6: Final answer
    x = 3,217.75

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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.