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Finding the Fourth Proportional to 13,718.60, 18,911.84 and 8,994.68

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Solution

The fourth proportional to 13,718.60, 18,911.84 and 8,994.68 is: 12,399.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,718.60 : 18,911.84 = 8,994.68 : x
  2. Step 2: Convert to fraction form
    13,718.60/18,911.84 = 8,994.68/x
  3. Step 3: Cross multiply
    13,718.60x = 18,911.84 × 8,994.68
  4. Step 4: Simplify right side
    13,718.60x = 170,105,949.01
  5. Step 5: Solve for x
    x = 170,105,949.01/13,718.60
  6. Step 6: Final answer
    x = 12,399.66

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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.