Home / 15,789.62-21,789.11-9,500.78

Finding the Fourth Proportional to 15,789.62, 21,789.11 and 9,500.78

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Solution

The fourth proportional to 15,789.62, 21,789.11 and 9,500.78 is: 13,110.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,789.62 : 21,789.11 = 9,500.78 : x
  2. Step 2: Convert to fraction form
    15,789.62/21,789.11 = 9,500.78/x
  3. Step 3: Cross multiply
    15,789.62x = 21,789.11 × 9,500.78
  4. Step 4: Simplify right side
    15,789.62x = 207,013,384.06
  5. Step 5: Solve for x
    x = 207,013,384.06/15,789.62
  6. Step 6: Final answer
    x = 13,110.73

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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.