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Finding the Fourth Proportional to 21,039.77, 29,034.77 and 11,479.65

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Solution

The fourth proportional to 21,039.77, 29,034.77 and 11,479.65 is: 15,841.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,039.77 : 29,034.77 = 11,479.65 : x
  2. Step 2: Convert to fraction form
    21,039.77/29,034.77 = 11,479.65/x
  3. Step 3: Cross multiply
    21,039.77x = 29,034.77 × 11,479.65
  4. Step 4: Simplify right side
    21,039.77x = 333,308,940.03
  5. Step 5: Solve for x
    x = 333,308,940.03/21,039.77
  6. Step 6: Final answer
    x = 15,841.86

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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.