Home / 20,990.72-28,954.88-12,609.28

Finding the Fourth Proportional to 20,990.72, 28,954.88 and 12,609.28

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Solution

The fourth proportional to 20,990.72, 28,954.88 and 12,609.28 is: 17,393.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.72 : 28,954.88 = 12,609.28 : x
  2. Step 2: Convert to fraction form
    20,990.72/28,954.88 = 12,609.28/x
  3. Step 3: Cross multiply
    20,990.72x = 28,954.88 × 12,609.28
  4. Step 4: Simplify right side
    20,990.72x = 365,100,189.29
  5. Step 5: Solve for x
    x = 365,100,189.29/20,990.72
  6. Step 6: Final answer
    x = 17,393.41

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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.