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Finding the Fourth Proportional to 21,819.25, 30,108.03 and 12,257.81

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Solution

The fourth proportional to 21,819.25, 30,108.03 and 12,257.81 is: 16,914.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,819.25 : 30,108.03 = 12,257.81 : x
  2. Step 2: Convert to fraction form
    21,819.25/30,108.03 = 12,257.81/x
  3. Step 3: Cross multiply
    21,819.25x = 30,108.03 × 12,257.81
  4. Step 4: Simplify right side
    21,819.25x = 369,058,511.21
  5. Step 5: Solve for x
    x = 369,058,511.21/21,819.25
  6. Step 6: Final answer
    x = 16,914.35

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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.