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Finding the Fourth Proportional to 70,940.49, 106,410.74 and 21,021.30

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Solution

The fourth proportional to 70,940.49, 106,410.74 and 21,021.30 is: 31,531.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,940.49 : 106,410.74 = 21,021.30 : x
  2. Step 2: Convert to fraction form
    70,940.49/106,410.74 = 21,021.30/x
  3. Step 3: Cross multiply
    70,940.49x = 106,410.74 × 21,021.30
  4. Step 4: Simplify right side
    70,940.49x = 2,236,891,983.66
  5. Step 5: Solve for x
    x = 2,236,891,983.66/70,940.49
  6. Step 6: Final answer
    x = 31,531.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.