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Finding the Fourth Proportional to 21,930.28, 30,261.95 and 12,976.22

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Solution

The fourth proportional to 21,930.28, 30,261.95 and 12,976.22 is: 17,906.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,930.28 : 30,261.95 = 12,976.22 : x
  2. Step 2: Convert to fraction form
    21,930.28/30,261.95 = 12,976.22/x
  3. Step 3: Cross multiply
    21,930.28x = 30,261.95 × 12,976.22
  4. Step 4: Simplify right side
    21,930.28x = 392,685,731.60
  5. Step 5: Solve for x
    x = 392,685,731.60/21,930.28
  6. Step 6: Final answer
    x = 17,906.10

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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.