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Finding the Fourth Proportional to 12,991.20, 19,429.20 and 10,917.60

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Solution

The fourth proportional to 12,991.20, 19,429.20 and 10,917.60 is: 16,327.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,991.20 : 19,429.20 = 10,917.60 : x
  2. Step 2: Convert to fraction form
    12,991.20/19,429.20 = 10,917.60/x
  3. Step 3: Cross multiply
    12,991.20x = 19,429.20 × 10,917.60
  4. Step 4: Simplify right side
    12,991.20x = 212,120,233.92
  5. Step 5: Solve for x
    x = 212,120,233.92/12,991.20
  6. Step 6: Final answer
    x = 16,327.99

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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.