Home / 20,809.31-28,716.93-11,378.07

Finding the Fourth Proportional to 20,809.31, 28,716.93 and 11,378.07

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Solution

The fourth proportional to 20,809.31, 28,716.93 and 11,378.07 is: 15,701.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,809.31 : 28,716.93 = 11,378.07 : x
  2. Step 2: Convert to fraction form
    20,809.31/28,716.93 = 11,378.07/x
  3. Step 3: Cross multiply
    20,809.31x = 28,716.93 × 11,378.07
  4. Step 4: Simplify right side
    20,809.31x = 326,743,239.73
  5. Step 5: Solve for x
    x = 326,743,239.73/20,809.31
  6. Step 6: Final answer
    x = 15,701.79

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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.