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Finding the Fourth Proportional to 15,790.74, 21,790.92 and 8,717.01

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Solution

The fourth proportional to 15,790.74, 21,790.92 and 8,717.01 is: 12,029.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,790.74 : 21,790.92 = 8,717.01 : x
  2. Step 2: Convert to fraction form
    15,790.74/21,790.92 = 8,717.01/x
  3. Step 3: Cross multiply
    15,790.74x = 21,790.92 × 8,717.01
  4. Step 4: Simplify right side
    15,790.74x = 189,951,667.55
  5. Step 5: Solve for x
    x = 189,951,667.55/15,790.74
  6. Step 6: Final answer
    x = 12,029.31

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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.