Home / 21,011.37-28,997.49-11,581.75

Finding the Fourth Proportional to 21,011.37, 28,997.49 and 11,581.75

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Solution

The fourth proportional to 21,011.37, 28,997.49 and 11,581.75 is: 15,983.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.37 : 28,997.49 = 11,581.75 : x
  2. Step 2: Convert to fraction form
    21,011.37/28,997.49 = 11,581.75/x
  3. Step 3: Cross multiply
    21,011.37x = 28,997.49 × 11,581.75
  4. Step 4: Simplify right side
    21,011.37x = 335,841,679.81
  5. Step 5: Solve for x
    x = 335,841,679.81/21,011.37
  6. Step 6: Final answer
    x = 15,983.81

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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.