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Finding the Fourth Proportional to 18,630.85, 25,722.05 and 12,819.95

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Solution

The fourth proportional to 18,630.85, 25,722.05 and 12,819.95 is: 17,699.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,630.85 : 25,722.05 = 12,819.95 : x
  2. Step 2: Convert to fraction form
    18,630.85/25,722.05 = 12,819.95/x
  3. Step 3: Cross multiply
    18,630.85x = 25,722.05 × 12,819.95
  4. Step 4: Simplify right side
    18,630.85x = 329,755,426.95
  5. Step 5: Solve for x
    x = 329,755,426.95/18,630.85
  6. Step 6: Final answer
    x = 17,699.43

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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.