Home / 21,151.85-29,190.71-11,720.21

Finding the Fourth Proportional to 21,151.85, 29,190.71 and 11,720.21

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Solution

The fourth proportional to 21,151.85, 29,190.71 and 11,720.21 is: 16,174.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,151.85 : 29,190.71 = 11,720.21 : x
  2. Step 2: Convert to fraction form
    21,151.85/29,190.71 = 11,720.21/x
  3. Step 3: Cross multiply
    21,151.85x = 29,190.71 × 11,720.21
  4. Step 4: Simplify right side
    21,151.85x = 342,121,134.60
  5. Step 5: Solve for x
    x = 342,121,134.60/21,151.85
  6. Step 6: Final answer
    x = 16,174.53

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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.