Home / 20,890-28,828.20-11,458.59

Finding the Fourth Proportional to 20,890, 28,828.20 and 11,458.59

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Solution

The fourth proportional to 20,890, 28,828.20 and 11,458.59 is: 15,812.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890 : 28,828.20 = 11,458.59 : x
  2. Step 2: Convert to fraction form
    20,890/28,828.20 = 11,458.59/x
  3. Step 3: Cross multiply
    20,890x = 28,828.20 × 11,458.59
  4. Step 4: Simplify right side
    20,890x = 330,330,380.10
  5. Step 5: Solve for x
    x = 330,330,380.10/20,890
  6. Step 6: Final answer
    x = 15,812.85

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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.