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Finding the Fourth Proportional to 21,672.80, 29,908.80 and 12,241.52

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Solution

The fourth proportional to 21,672.80, 29,908.80 and 12,241.52 is: 16,893.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,672.80 : 29,908.80 = 12,241.52 : x
  2. Step 2: Convert to fraction form
    21,672.80/29,908.80 = 12,241.52/x
  3. Step 3: Cross multiply
    21,672.80x = 29,908.80 × 12,241.52
  4. Step 4: Simplify right side
    21,672.80x = 366,129,173.38
  5. Step 5: Solve for x
    x = 366,129,173.38/21,672.80
  6. Step 6: Final answer
    x = 16,893.49

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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.