Home / 20,381.52-28,127.22-11,428.86

Finding the Fourth Proportional to 20,381.52, 28,127.22 and 11,428.86

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Solution

The fourth proportional to 20,381.52, 28,127.22 and 11,428.86 is: 15,772.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,381.52 : 28,127.22 = 11,428.86 : x
  2. Step 2: Convert to fraction form
    20,381.52/28,127.22 = 11,428.86/x
  3. Step 3: Cross multiply
    20,381.52x = 28,127.22 × 11,428.86
  4. Step 4: Simplify right side
    20,381.52x = 321,462,059.57
  5. Step 5: Solve for x
    x = 321,462,059.57/20,381.52
  6. Step 6: Final answer
    x = 15,772.23

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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.