Home / 20,991.79-28,969.14-11,560.42

Finding the Fourth Proportional to 20,991.79, 28,969.14 and 11,560.42

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Solution

The fourth proportional to 20,991.79, 28,969.14 and 11,560.42 is: 15,953.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.79 : 28,969.14 = 11,560.42 : x
  2. Step 2: Convert to fraction form
    20,991.79/28,969.14 = 11,560.42/x
  3. Step 3: Cross multiply
    20,991.79x = 28,969.14 × 11,560.42
  4. Step 4: Simplify right side
    20,991.79x = 334,895,425.44
  5. Step 5: Solve for x
    x = 334,895,425.44/20,991.79
  6. Step 6: Final answer
    x = 15,953.64

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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.