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Finding the Fourth Proportional to 18,116.70, 27,138.60 and 12,211.80

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Solution

The fourth proportional to 18,116.70, 27,138.60 and 12,211.80 is: 18,293.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,116.70 : 27,138.60 = 12,211.80 : x
  2. Step 2: Convert to fraction form
    18,116.70/27,138.60 = 12,211.80/x
  3. Step 3: Cross multiply
    18,116.70x = 27,138.60 × 12,211.80
  4. Step 4: Simplify right side
    18,116.70x = 331,411,155.48
  5. Step 5: Solve for x
    x = 331,411,155.48/18,116.70
  6. Step 6: Final answer
    x = 18,293.13

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1.5x scale

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.