Home / 20,991.78-28,968.93-11,561.04

Finding the Fourth Proportional to 20,991.78, 28,968.93 and 11,561.04

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Solution

The fourth proportional to 20,991.78, 28,968.93 and 11,561.04 is: 15,954.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.78 : 28,968.93 = 11,561.04 : x
  2. Step 2: Convert to fraction form
    20,991.78/28,968.93 = 11,561.04/x
  3. Step 3: Cross multiply
    20,991.78x = 28,968.93 × 11,561.04
  4. Step 4: Simplify right side
    20,991.78x = 334,910,958.49
  5. Step 5: Solve for x
    x = 334,910,958.49/20,991.78
  6. Step 6: Final answer
    x = 15,954.39

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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.