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Finding the Fourth Proportional to 21,893.43, 30,215.21 and 13,401.21

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Solution

The fourth proportional to 21,893.43, 30,215.21 and 13,401.21 is: 18,495.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,893.43 : 30,215.21 = 13,401.21 : x
  2. Step 2: Convert to fraction form
    21,893.43/30,215.21 = 13,401.21/x
  3. Step 3: Cross multiply
    21,893.43x = 30,215.21 × 13,401.21
  4. Step 4: Simplify right side
    21,893.43x = 404,920,374.40
  5. Step 5: Solve for x
    x = 404,920,374.40/21,893.43
  6. Step 6: Final answer
    x = 18,495.06

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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.