Home / 20,919.36-28,868.60-11,359.44

Finding the Fourth Proportional to 20,919.36, 28,868.60 and 11,359.44

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Solution

The fourth proportional to 20,919.36, 28,868.60 and 11,359.44 is: 15,675.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.36 : 28,868.60 = 11,359.44 : x
  2. Step 2: Convert to fraction form
    20,919.36/28,868.60 = 11,359.44/x
  3. Step 3: Cross multiply
    20,919.36x = 28,868.60 × 11,359.44
  4. Step 4: Simplify right side
    20,919.36x = 327,931,129.58
  5. Step 5: Solve for x
    x = 327,931,129.58/20,919.36
  6. Step 6: Final answer
    x = 15,675.96

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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.