Home / 13,859.05-19,121.38-7,890.70

Finding the Fourth Proportional to 13,859.05, 19,121.38 and 7,890.70

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Solution

The fourth proportional to 13,859.05, 19,121.38 and 7,890.70 is: 10,886.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,859.05 : 19,121.38 = 7,890.70 : x
  2. Step 2: Convert to fraction form
    13,859.05/19,121.38 = 7,890.70/x
  3. Step 3: Cross multiply
    13,859.05x = 19,121.38 × 7,890.70
  4. Step 4: Simplify right side
    13,859.05x = 150,881,073.17
  5. Step 5: Solve for x
    x = 150,881,073.17/13,859.05
  6. Step 6: Final answer
    x = 10,886.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.