Home / 20,811.30-28,719.70-11,380.08

Finding the Fourth Proportional to 20,811.30, 28,719.70 and 11,380.08

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Solution

The fourth proportional to 20,811.30, 28,719.70 and 11,380.08 is: 15,704.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.30 : 28,719.70 = 11,380.08 : x
  2. Step 2: Convert to fraction form
    20,811.30/28,719.70 = 11,380.08/x
  3. Step 3: Cross multiply
    20,811.30x = 28,719.70 × 11,380.08
  4. Step 4: Simplify right side
    20,811.30x = 326,832,483.58
  5. Step 5: Solve for x
    x = 326,832,483.58/20,811.30
  6. Step 6: Final answer
    x = 15,704.57

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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.