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Finding the Fourth Proportional to 21,125, 29,149.80 and 12,172.88

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Solution

The fourth proportional to 21,125, 29,149.80 and 12,172.88 is: 16,797.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,125 : 29,149.80 = 12,172.88 : x
  2. Step 2: Convert to fraction form
    21,125/29,149.80 = 12,172.88/x
  3. Step 3: Cross multiply
    21,125x = 29,149.80 × 12,172.88
  4. Step 4: Simplify right side
    21,125x = 354,837,017.42
  5. Step 5: Solve for x
    x = 354,837,017.42/21,125
  6. Step 6: Final answer
    x = 16,797.02

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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.