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Finding the Fourth Proportional to 12,405.96, 18,591.40 and 9,619.68

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Solution

The fourth proportional to 12,405.96, 18,591.40 and 9,619.68 is: 14,415.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,405.96 : 18,591.40 = 9,619.68 : x
  2. Step 2: Convert to fraction form
    12,405.96/18,591.40 = 9,619.68/x
  3. Step 3: Cross multiply
    12,405.96x = 18,591.40 × 9,619.68
  4. Step 4: Simplify right side
    12,405.96x = 178,843,318.75
  5. Step 5: Solve for x
    x = 178,843,318.75/12,405.96
  6. Step 6: Final answer
    x = 14,415.92

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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.