Home / 15,890.92-21,929.46-8,720.88

Finding the Fourth Proportional to 15,890.92, 21,929.46 and 8,720.88

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Solution

The fourth proportional to 15,890.92, 21,929.46 and 8,720.88 is: 12,034.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,890.92 : 21,929.46 = 8,720.88 : x
  2. Step 2: Convert to fraction form
    15,890.92/21,929.46 = 8,720.88/x
  3. Step 3: Cross multiply
    15,890.92x = 21,929.46 × 8,720.88
  4. Step 4: Simplify right side
    15,890.92x = 191,244,189.12
  5. Step 5: Solve for x
    x = 191,244,189.12/15,890.92
  6. Step 6: Final answer
    x = 12,034.81

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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.