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Finding the Fourth Proportional to 21,691.63, 29,926.15 and 16,039.99

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Solution

The fourth proportional to 21,691.63, 29,926.15 and 16,039.99 is: 22,129.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,691.63 : 29,926.15 = 16,039.99 : x
  2. Step 2: Convert to fraction form
    21,691.63/29,926.15 = 16,039.99/x
  3. Step 3: Cross multiply
    21,691.63x = 29,926.15 × 16,039.99
  4. Step 4: Simplify right side
    21,691.63x = 480,015,146.74
  5. Step 5: Solve for x
    x = 480,015,146.74/21,691.63
  6. Step 6: Final answer
    x = 22,129.05

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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.