Home / 20,672.72-28,528.44-12,289.28

Finding the Fourth Proportional to 20,672.72, 28,528.44 and 12,289.28

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Solution

The fourth proportional to 20,672.72, 28,528.44 and 12,289.28 is: 16,959.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,672.72 : 28,528.44 = 12,289.28 : x
  2. Step 2: Convert to fraction form
    20,672.72/28,528.44 = 12,289.28/x
  3. Step 3: Cross multiply
    20,672.72x = 28,528.44 × 12,289.28
  4. Step 4: Simplify right side
    20,672.72x = 350,593,987.12
  5. Step 5: Solve for x
    x = 350,593,987.12/20,672.72
  6. Step 6: Final answer
    x = 16,959.26

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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.