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Finding the Fourth Proportional to 15,789.42, 21,790.08 and 8,715.69

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Solution

The fourth proportional to 15,789.42, 21,790.08 and 8,715.69 is: 12,028.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,789.42 : 21,790.08 = 8,715.69 : x
  2. Step 2: Convert to fraction form
    15,789.42/21,790.08 = 8,715.69/x
  3. Step 3: Cross multiply
    15,789.42x = 21,790.08 × 8,715.69
  4. Step 4: Simplify right side
    15,789.42x = 189,915,582.36
  5. Step 5: Solve for x
    x = 189,915,582.36/15,789.42
  6. Step 6: Final answer
    x = 12,028.03

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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.