Home / 7,911.21-11,868.09-2,981.28

Finding the Fourth Proportional to 7,911.21, 11,868.09 and 2,981.28

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Solution

The fourth proportional to 7,911.21, 11,868.09 and 2,981.28 is: 4,472.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,911.21 : 11,868.09 = 2,981.28 : x
  2. Step 2: Convert to fraction form
    7,911.21/11,868.09 = 2,981.28/x
  3. Step 3: Cross multiply
    7,911.21x = 11,868.09 × 2,981.28
  4. Step 4: Simplify right side
    7,911.21x = 35,382,099.36
  5. Step 5: Solve for x
    x = 35,382,099.36/7,911.21
  6. Step 6: Final answer
    x = 4,472.40

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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.