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Finding the Fourth Proportional to 21,151.44, 29,189.16 and 11,720.16

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Solution

The fourth proportional to 21,151.44, 29,189.16 and 11,720.16 is: 16,173.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,151.44 : 29,189.16 = 11,720.16 : x
  2. Step 2: Convert to fraction form
    21,151.44/29,189.16 = 11,720.16/x
  3. Step 3: Cross multiply
    21,151.44x = 29,189.16 × 11,720.16
  4. Step 4: Simplify right side
    21,151.44x = 342,101,625.47
  5. Step 5: Solve for x
    x = 342,101,625.47/21,151.44
  6. Step 6: Final answer
    x = 16,173.92

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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.