Home / 15,221.92-21,005.22-8,507.20

Finding the Fourth Proportional to 15,221.92, 21,005.22 and 8,507.20

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Solution

The fourth proportional to 15,221.92, 21,005.22 and 8,507.20 is: 11,739.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,221.92 : 21,005.22 = 8,507.20 : x
  2. Step 2: Convert to fraction form
    15,221.92/21,005.22 = 8,507.20/x
  3. Step 3: Cross multiply
    15,221.92x = 21,005.22 × 8,507.20
  4. Step 4: Simplify right side
    15,221.92x = 178,695,607.58
  5. Step 5: Solve for x
    x = 178,695,607.58/15,221.92
  6. Step 6: Final answer
    x = 11,739.36

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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.