Home / 20,986.56-28,960.96-11,555.04

Finding the Fourth Proportional to 20,986.56, 28,960.96 and 11,555.04

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Solution

The fourth proportional to 20,986.56, 28,960.96 and 11,555.04 is: 15,945.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.56 : 28,960.96 = 11,555.04 : x
  2. Step 2: Convert to fraction form
    20,986.56/28,960.96 = 11,555.04/x
  3. Step 3: Cross multiply
    20,986.56x = 28,960.96 × 11,555.04
  4. Step 4: Simplify right side
    20,986.56x = 334,645,051.24
  5. Step 5: Solve for x
    x = 334,645,051.24/20,986.56
  6. Step 6: Final answer
    x = 15,945.68

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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.