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Finding the Fourth Proportional to 13,999.60, 20,999.40 and 12,881.80

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Solution

The fourth proportional to 13,999.60, 20,999.40 and 12,881.80 is: 19,322.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,999.60 : 20,999.40 = 12,881.80 : x
  2. Step 2: Convert to fraction form
    13,999.60/20,999.40 = 12,881.80/x
  3. Step 3: Cross multiply
    13,999.60x = 20,999.40 × 12,881.80
  4. Step 4: Simplify right side
    13,999.60x = 270,510,070.92
  5. Step 5: Solve for x
    x = 270,510,070.92/13,999.60
  6. Step 6: Final answer
    x = 19,322.70

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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.