Home / 15,305.60-21,121.60-8,591.20

Finding the Fourth Proportional to 15,305.60, 21,121.60 and 8,591.20

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Solution

The fourth proportional to 15,305.60, 21,121.60 and 8,591.20 is: 11,855.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,305.60 : 21,121.60 = 8,591.20 : x
  2. Step 2: Convert to fraction form
    15,305.60/21,121.60 = 8,591.20/x
  3. Step 3: Cross multiply
    15,305.60x = 21,121.60 × 8,591.20
  4. Step 4: Simplify right side
    15,305.60x = 181,459,889.92
  5. Step 5: Solve for x
    x = 181,459,889.92/15,305.60
  6. Step 6: Final answer
    x = 11,855.78

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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.