Home / 20,999.34-28,979.43-11,567.91

Finding the Fourth Proportional to 20,999.34, 28,979.43 and 11,567.91

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Solution

The fourth proportional to 20,999.34, 28,979.43 and 11,567.91 is: 15,963.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.34 : 28,979.43 = 11,567.91 : x
  2. Step 2: Convert to fraction form
    20,999.34/28,979.43 = 11,567.91/x
  3. Step 3: Cross multiply
    20,999.34x = 28,979.43 × 11,567.91
  4. Step 4: Simplify right side
    20,999.34x = 335,231,438.09
  5. Step 5: Solve for x
    x = 335,231,438.09/20,999.34
  6. Step 6: Final answer
    x = 15,963.90

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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.