Home / 15,403.77-21,221.19-12,742.92

Finding the Fourth Proportional to 15,403.77, 21,221.19 and 12,742.92

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Solution

The fourth proportional to 15,403.77, 21,221.19 and 12,742.92 is: 17,555.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,403.77 : 21,221.19 = 12,742.92 : x
  2. Step 2: Convert to fraction form
    15,403.77/21,221.19 = 12,742.92/x
  3. Step 3: Cross multiply
    15,403.77x = 21,221.19 × 12,742.92
  4. Step 4: Simplify right side
    15,403.77x = 270,419,926.47
  5. Step 5: Solve for x
    x = 270,419,926.47/15,403.77
  6. Step 6: Final answer
    x = 17,555.44

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Half scale
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Double scale
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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.