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Finding the Fourth Proportional to 21,908.21, 30,233.31 and 11,972.21

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Solution

The fourth proportional to 21,908.21, 30,233.31 and 11,972.21 is: 16,521.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,908.21 : 30,233.31 = 11,972.21 : x
  2. Step 2: Convert to fraction form
    21,908.21/30,233.31 = 11,972.21/x
  3. Step 3: Cross multiply
    21,908.21x = 30,233.31 × 11,972.21
  4. Step 4: Simplify right side
    21,908.21x = 361,959,536.32
  5. Step 5: Solve for x
    x = 361,959,536.32/21,908.21
  6. Step 6: Final answer
    x = 16,521.64

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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.