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Finding the Fourth Proportional to 11,993.55, 17,980.61 and 5,415.54

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Solution

The fourth proportional to 11,993.55, 17,980.61 and 5,415.54 is: 8,118.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,993.55 : 17,980.61 = 5,415.54 : x
  2. Step 2: Convert to fraction form
    11,993.55/17,980.61 = 5,415.54/x
  3. Step 3: Cross multiply
    11,993.55x = 17,980.61 × 5,415.54
  4. Step 4: Simplify right side
    11,993.55x = 97,374,685.60
  5. Step 5: Solve for x
    x = 97,374,685.60/11,993.55
  6. Step 6: Final answer
    x = 8,118.92

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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.