Home / 21,919.32-30,249.78-12,971.96

Finding the Fourth Proportional to 21,919.32, 30,249.78 and 12,971.96

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Solution

The fourth proportional to 21,919.32, 30,249.78 and 12,971.96 is: 17,901.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,919.32 : 30,249.78 = 12,971.96 : x
  2. Step 2: Convert to fraction form
    21,919.32/30,249.78 = 12,971.96/x
  3. Step 3: Cross multiply
    21,919.32x = 30,249.78 × 12,971.96
  4. Step 4: Simplify right side
    21,919.32x = 392,398,936.17
  5. Step 5: Solve for x
    x = 392,398,936.17/21,919.32
  6. Step 6: Final answer
    x = 17,901.97

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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.