Home / 20,887.20-28,811.70-13,815.90

Finding the Fourth Proportional to 20,887.20, 28,811.70 and 13,815.90

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Solution

The fourth proportional to 20,887.20, 28,811.70 and 13,815.90 is: 19,057.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,887.20 : 28,811.70 = 13,815.90 : x
  2. Step 2: Convert to fraction form
    20,887.20/28,811.70 = 13,815.90/x
  3. Step 3: Cross multiply
    20,887.20x = 28,811.70 × 13,815.90
  4. Step 4: Simplify right side
    20,887.20x = 398,059,566.03
  5. Step 5: Solve for x
    x = 398,059,566.03/20,887.20
  6. Step 6: Final answer
    x = 19,057.58

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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.