Home / 20,919.54-28,869-11,488.70

Finding the Fourth Proportional to 20,919.54, 28,869 and 11,488.70

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Solution

The fourth proportional to 20,919.54, 28,869 and 11,488.70 is: 15,854.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.54 : 28,869 = 11,488.70 : x
  2. Step 2: Convert to fraction form
    20,919.54/28,869 = 11,488.70/x
  3. Step 3: Cross multiply
    20,919.54x = 28,869 × 11,488.70
  4. Step 4: Simplify right side
    20,919.54x = 331,667,280.30
  5. Step 5: Solve for x
    x = 331,667,280.30/20,919.54
  6. Step 6: Final answer
    x = 15,854.43

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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.