Home / 20,811.75-28,720.34-13,359.75

Finding the Fourth Proportional to 20,811.75, 28,720.34 and 13,359.75

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Solution

The fourth proportional to 20,811.75, 28,720.34 and 13,359.75 is: 18,436.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.75 : 28,720.34 = 13,359.75 : x
  2. Step 2: Convert to fraction form
    20,811.75/28,720.34 = 13,359.75/x
  3. Step 3: Cross multiply
    20,811.75x = 28,720.34 × 13,359.75
  4. Step 4: Simplify right side
    20,811.75x = 383,696,495.52
  5. Step 5: Solve for x
    x = 383,696,495.52/20,811.75
  6. Step 6: Final answer
    x = 18,436.53

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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.