Home / 20,991.52-28,969.94-11,561.76

Finding the Fourth Proportional to 20,991.52, 28,969.94 and 11,561.76

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Solution

The fourth proportional to 20,991.52, 28,969.94 and 11,561.76 is: 15,956.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.52 : 28,969.94 = 11,561.76 : x
  2. Step 2: Convert to fraction form
    20,991.52/28,969.94 = 11,561.76/x
  3. Step 3: Cross multiply
    20,991.52x = 28,969.94 × 11,561.76
  4. Step 4: Simplify right side
    20,991.52x = 334,943,493.49
  5. Step 5: Solve for x
    x = 334,943,493.49/20,991.52
  6. Step 6: Final answer
    x = 15,956.13

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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.