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Finding the Fourth Proportional to 12,999.60, 19,499.40 and 12,179.48

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Solution

The fourth proportional to 12,999.60, 19,499.40 and 12,179.48 is: 18,269.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,999.60 : 19,499.40 = 12,179.48 : x
  2. Step 2: Convert to fraction form
    12,999.60/19,499.40 = 12,179.48/x
  3. Step 3: Cross multiply
    12,999.60x = 19,499.40 × 12,179.48
  4. Step 4: Simplify right side
    12,999.60x = 237,492,454.82
  5. Step 5: Solve for x
    x = 237,492,454.82/12,999.60
  6. Step 6: Final answer
    x = 18,269.21

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Similar ratio
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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.