Home / 20,405.71-28,161.13-11,453.79

Finding the Fourth Proportional to 20,405.71, 28,161.13 and 11,453.79

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Solution

The fourth proportional to 20,405.71, 28,161.13 and 11,453.79 is: 15,806.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,405.71 : 28,161.13 = 11,453.79 : x
  2. Step 2: Convert to fraction form
    20,405.71/28,161.13 = 11,453.79/x
  3. Step 3: Cross multiply
    20,405.71x = 28,161.13 × 11,453.79
  4. Step 4: Simplify right side
    20,405.71x = 322,551,669.18
  5. Step 5: Solve for x
    x = 322,551,669.18/20,405.71
  6. Step 6: Final answer
    x = 15,806.93

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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.