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Finding the Fourth Proportional to 21,081.42, 29,091.24 and 11,649.42

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Solution

The fourth proportional to 21,081.42, 29,091.24 and 11,649.42 is: 16,075.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,081.42 : 29,091.24 = 11,649.42 : x
  2. Step 2: Convert to fraction form
    21,081.42/29,091.24 = 11,649.42/x
  3. Step 3: Cross multiply
    21,081.42x = 29,091.24 × 11,649.42
  4. Step 4: Simplify right side
    21,081.42x = 338,896,073.08
  5. Step 5: Solve for x
    x = 338,896,073.08/21,081.42
  6. Step 6: Final answer
    x = 16,075.58

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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.