Home / 15,789.69-21,790.07-8,715.96

Finding the Fourth Proportional to 15,789.69, 21,790.07 and 8,715.96

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Solution

The fourth proportional to 15,789.69, 21,790.07 and 8,715.96 is: 12,028.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,789.69 : 21,790.07 = 8,715.96 : x
  2. Step 2: Convert to fraction form
    15,789.69/21,790.07 = 8,715.96/x
  3. Step 3: Cross multiply
    15,789.69x = 21,790.07 × 8,715.96
  4. Step 4: Simplify right side
    15,789.69x = 189,921,378.52
  5. Step 5: Solve for x
    x = 189,921,378.52/15,789.69
  6. Step 6: Final answer
    x = 12,028.19

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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.