Home / 20,951.30-28,912.32-11,391.05

Finding the Fourth Proportional to 20,951.30, 28,912.32 and 11,391.05

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Solution

The fourth proportional to 20,951.30, 28,912.32 and 11,391.05 is: 15,719.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,951.30 : 28,912.32 = 11,391.05 : x
  2. Step 2: Convert to fraction form
    20,951.30/28,912.32 = 11,391.05/x
  3. Step 3: Cross multiply
    20,951.30x = 28,912.32 × 11,391.05
  4. Step 4: Simplify right side
    20,951.30x = 329,341,682.74
  5. Step 5: Solve for x
    x = 329,341,682.74/20,951.30
  6. Step 6: Final answer
    x = 15,719.39

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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.