Home / 21,012.89-28,997.78-11,581.45

Finding the Fourth Proportional to 21,012.89, 28,997.78 and 11,581.45

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Solution

The fourth proportional to 21,012.89, 28,997.78 and 11,581.45 is: 15,982.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,012.89 : 28,997.78 = 11,581.45 : x
  2. Step 2: Convert to fraction form
    21,012.89/28,997.78 = 11,581.45/x
  3. Step 3: Cross multiply
    21,012.89x = 28,997.78 × 11,581.45
  4. Step 4: Simplify right side
    21,012.89x = 335,836,404.38
  5. Step 5: Solve for x
    x = 335,836,404.38/21,012.89
  6. Step 6: Final answer
    x = 15,982.40

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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.