Home / 21,012.88-28,997.56-11,581.28

Finding the Fourth Proportional to 21,012.88, 28,997.56 and 11,581.28

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Solution

The fourth proportional to 21,012.88, 28,997.56 and 11,581.28 is: 15,982.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,012.88 : 28,997.56 = 11,581.28 : x
  2. Step 2: Convert to fraction form
    21,012.88/28,997.56 = 11,581.28/x
  3. Step 3: Cross multiply
    21,012.88x = 28,997.56 × 11,581.28
  4. Step 4: Simplify right side
    21,012.88x = 335,828,861.68
  5. Step 5: Solve for x
    x = 335,828,861.68/21,012.88
  6. Step 6: Final answer
    x = 15,982.05

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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.