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Finding the Fourth Proportional to 13,640.85, 18,819.85 and 11,118.63

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Solution

The fourth proportional to 13,640.85, 18,819.85 and 11,118.63 is: 15,340.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,640.85 : 18,819.85 = 11,118.63 : x
  2. Step 2: Convert to fraction form
    13,640.85/18,819.85 = 11,118.63/x
  3. Step 3: Cross multiply
    13,640.85x = 18,819.85 × 11,118.63
  4. Step 4: Simplify right side
    13,640.85x = 209,250,948.81
  5. Step 5: Solve for x
    x = 209,250,948.81/13,640.85
  6. Step 6: Final answer
    x = 15,340.02

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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.