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Finding the Fourth Proportional to 15,790.79, 21,789.32 and 8,717.16

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Solution

The fourth proportional to 15,790.79, 21,789.32 and 8,717.16 is: 12,028.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,790.79 : 21,789.32 = 8,717.16 : x
  2. Step 2: Convert to fraction form
    15,790.79/21,789.32 = 8,717.16/x
  3. Step 3: Cross multiply
    15,790.79x = 21,789.32 × 8,717.16
  4. Step 4: Simplify right side
    15,790.79x = 189,941,010.52
  5. Step 5: Solve for x
    x = 189,941,010.52/15,790.79
  6. Step 6: Final answer
    x = 12,028.59

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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.