Home / 20,781-28,674.54-11,828.88

Finding the Fourth Proportional to 20,781, 28,674.54 and 11,828.88

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Solution

The fourth proportional to 20,781, 28,674.54 and 11,828.88 is: 16,322.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781 : 28,674.54 = 11,828.88 : x
  2. Step 2: Convert to fraction form
    20,781/28,674.54 = 11,828.88/x
  3. Step 3: Cross multiply
    20,781x = 28,674.54 × 11,828.88
  4. Step 4: Simplify right side
    20,781x = 339,187,692.72
  5. Step 5: Solve for x
    x = 339,187,692.72/20,781
  6. Step 6: Final answer
    x = 16,322.01

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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.