Home / 15,790.31-21,790.68-8,716.72

Finding the Fourth Proportional to 15,790.31, 21,790.68 and 8,716.72

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Solution

The fourth proportional to 15,790.31, 21,790.68 and 8,716.72 is: 12,029.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,790.31 : 21,790.68 = 8,716.72 : x
  2. Step 2: Convert to fraction form
    15,790.31/21,790.68 = 8,716.72/x
  3. Step 3: Cross multiply
    15,790.31x = 21,790.68 × 8,716.72
  4. Step 4: Simplify right side
    15,790.31x = 189,943,147.22
  5. Step 5: Solve for x
    x = 189,943,147.22/15,790.31
  6. Step 6: Final answer
    x = 12,029.10

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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.