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Finding the Fourth Proportional to 21,890.52, 30,211.14 and 12,940.92

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Solution

The fourth proportional to 21,890.52, 30,211.14 and 12,940.92 is: 17,859.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,890.52 : 30,211.14 = 12,940.92 : x
  2. Step 2: Convert to fraction form
    21,890.52/30,211.14 = 12,940.92/x
  3. Step 3: Cross multiply
    21,890.52x = 30,211.14 × 12,940.92
  4. Step 4: Simplify right side
    21,890.52x = 390,959,945.85
  5. Step 5: Solve for x
    x = 390,959,945.85/21,890.52
  6. Step 6: Final answer
    x = 17,859.78

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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.