Home / 21,121.20-29,147.40-11,690.28

Finding the Fourth Proportional to 21,121.20, 29,147.40 and 11,690.28

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Solution

The fourth proportional to 21,121.20, 29,147.40 and 11,690.28 is: 16,132.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.20 : 29,147.40 = 11,690.28 : x
  2. Step 2: Convert to fraction form
    21,121.20/29,147.40 = 11,690.28/x
  3. Step 3: Cross multiply
    21,121.20x = 29,147.40 × 11,690.28
  4. Step 4: Simplify right side
    21,121.20x = 340,741,267.27
  5. Step 5: Solve for x
    x = 340,741,267.27/21,121.20
  6. Step 6: Final answer
    x = 16,132.67

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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.