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Finding the Fourth Proportional to 21,889.85, 30,207.94 and 12,458.41

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Solution

The fourth proportional to 21,889.85, 30,207.94 and 12,458.41 is: 17,192.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,889.85 : 30,207.94 = 12,458.41 : x
  2. Step 2: Convert to fraction form
    21,889.85/30,207.94 = 12,458.41/x
  3. Step 3: Cross multiply
    21,889.85x = 30,207.94 × 12,458.41
  4. Step 4: Simplify right side
    21,889.85x = 376,342,795.11
  5. Step 5: Solve for x
    x = 376,342,795.11/21,889.85
  6. Step 6: Final answer
    x = 17,192.57

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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.