Home / 20,667.86-28,528.15-11,721.31

Finding the Fourth Proportional to 20,667.86, 28,528.15 and 11,721.31

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Solution

The fourth proportional to 20,667.86, 28,528.15 and 11,721.31 is: 16,179.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,667.86 : 28,528.15 = 11,721.31 : x
  2. Step 2: Convert to fraction form
    20,667.86/28,528.15 = 11,721.31/x
  3. Step 3: Cross multiply
    20,667.86x = 28,528.15 × 11,721.31
  4. Step 4: Simplify right side
    20,667.86x = 334,387,211.23
  5. Step 5: Solve for x
    x = 334,387,211.23/20,667.86
  6. Step 6: Final answer
    x = 16,179.09

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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.