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Finding the Fourth Proportional to 21,081.61, 29,090.14 and 11,649.61

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Solution

The fourth proportional to 21,081.61, 29,090.14 and 11,649.61 is: 16,075.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,081.61 : 29,090.14 = 11,649.61 : x
  2. Step 2: Convert to fraction form
    21,081.61/29,090.14 = 11,649.61/x
  3. Step 3: Cross multiply
    21,081.61x = 29,090.14 × 11,649.61
  4. Step 4: Simplify right side
    21,081.61x = 338,888,785.85
  5. Step 5: Solve for x
    x = 338,888,785.85/21,081.61
  6. Step 6: Final answer
    x = 16,075.09

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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.