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Finding the Fourth Proportional to 21,889.56, 30,207.96 and 12,459

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Solution

The fourth proportional to 21,889.56, 30,207.96 and 12,459 is: 17,193.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,889.56 : 30,207.96 = 12,459 : x
  2. Step 2: Convert to fraction form
    21,889.56/30,207.96 = 12,459/x
  3. Step 3: Cross multiply
    21,889.56x = 30,207.96 × 12,459
  4. Step 4: Simplify right side
    21,889.56x = 376,360,973.64
  5. Step 5: Solve for x
    x = 376,360,973.64/21,889.56
  6. Step 6: Final answer
    x = 17,193.63

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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.