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Finding the Fourth Proportional to 21,908.70, 30,234.63 and 13,410.66

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Solution

The fourth proportional to 21,908.70, 30,234.63 and 13,410.66 is: 18,507.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,908.70 : 30,234.63 = 13,410.66 : x
  2. Step 2: Convert to fraction form
    21,908.70/30,234.63 = 13,410.66/x
  3. Step 3: Cross multiply
    21,908.70x = 30,234.63 × 13,410.66
  4. Step 4: Simplify right side
    21,908.70x = 405,466,343.16
  5. Step 5: Solve for x
    x = 405,466,343.16/21,908.70
  6. Step 6: Final answer
    x = 18,507.09

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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.