Home / 20,561.38-28,374.71-11,129.94

Finding the Fourth Proportional to 20,561.38, 28,374.71 and 11,129.94

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Solution

The fourth proportional to 20,561.38, 28,374.71 and 11,129.94 is: 15,359.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,561.38 : 28,374.71 = 11,129.94 : x
  2. Step 2: Convert to fraction form
    20,561.38/28,374.71 = 11,129.94/x
  3. Step 3: Cross multiply
    20,561.38x = 28,374.71 × 11,129.94
  4. Step 4: Simplify right side
    20,561.38x = 315,808,764.17
  5. Step 5: Solve for x
    x = 315,808,764.17/20,561.38
  6. Step 6: Final answer
    x = 15,359.32

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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.