Home / 21,011.50-28,997.66-11,581.89

Finding the Fourth Proportional to 21,011.50, 28,997.66 and 11,581.89

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Solution

The fourth proportional to 21,011.50, 28,997.66 and 11,581.89 is: 15,983.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.50 : 28,997.66 = 11,581.89 : x
  2. Step 2: Convert to fraction form
    21,011.50/28,997.66 = 11,581.89/x
  3. Step 3: Cross multiply
    21,011.50x = 28,997.66 × 11,581.89
  4. Step 4: Simplify right side
    21,011.50x = 335,847,628.59
  5. Step 5: Solve for x
    x = 335,847,628.59/21,011.50
  6. Step 6: Final answer
    x = 15,983.99

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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.