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Finding the Fourth Proportional to 21,070.71, 29,079.09 and 12,121.02

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Solution

The fourth proportional to 21,070.71, 29,079.09 and 12,121.02 is: 16,727.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,070.71 : 29,079.09 = 12,121.02 : x
  2. Step 2: Convert to fraction form
    21,070.71/29,079.09 = 12,121.02/x
  3. Step 3: Cross multiply
    21,070.71x = 29,079.09 × 12,121.02
  4. Step 4: Simplify right side
    21,070.71x = 352,468,231.47
  5. Step 5: Solve for x
    x = 352,468,231.47/21,070.71
  6. Step 6: Final answer
    x = 16,727.88

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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.