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Finding the Fourth Proportional to 13,680.54, 18,879.12 and 7,392.90

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Solution

The fourth proportional to 13,680.54, 18,879.12 and 7,392.90 is: 10,202.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,680.54 : 18,879.12 = 7,392.90 : x
  2. Step 2: Convert to fraction form
    13,680.54/18,879.12 = 7,392.90/x
  3. Step 3: Cross multiply
    13,680.54x = 18,879.12 × 7,392.90
  4. Step 4: Simplify right side
    13,680.54x = 139,571,446.25
  5. Step 5: Solve for x
    x = 139,571,446.25/13,680.54
  6. Step 6: Final answer
    x = 10,202.19

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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.