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Finding the Fourth Proportional to 21,893.44, 30,207.39 and 13,392.47

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Solution

The fourth proportional to 21,893.44, 30,207.39 and 13,392.47 is: 18,478.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,893.44 : 30,207.39 = 13,392.47 : x
  2. Step 2: Convert to fraction form
    21,893.44/30,207.39 = 13,392.47/x
  3. Step 3: Cross multiply
    21,893.44x = 30,207.39 × 13,392.47
  4. Step 4: Simplify right side
    21,893.44x = 404,551,564.35
  5. Step 5: Solve for x
    x = 404,551,564.35/21,893.44
  6. Step 6: Final answer
    x = 18,478.21

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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.