Home / 11,987.70-17,981.70-6,721.89

Finding the Fourth Proportional to 11,987.70, 17,981.70 and 6,721.89

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Solution

The fourth proportional to 11,987.70, 17,981.70 and 6,721.89 is: 10,082.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,987.70 : 17,981.70 = 6,721.89 : x
  2. Step 2: Convert to fraction form
    11,987.70/17,981.70 = 6,721.89/x
  3. Step 3: Cross multiply
    11,987.70x = 17,981.70 × 6,721.89
  4. Step 4: Simplify right side
    11,987.70x = 120,870,916.77
  5. Step 5: Solve for x
    x = 120,870,916.77/11,987.70
  6. Step 6: Final answer
    x = 10,082.91

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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.