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Finding the Fourth Proportional to 11,991.95, 17,989.20 and 4,602.72

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Solution

The fourth proportional to 11,991.95, 17,989.20 and 4,602.72 is: 6,904.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,991.95 : 17,989.20 = 4,602.72 : x
  2. Step 2: Convert to fraction form
    11,991.95/17,989.20 = 4,602.72/x
  3. Step 3: Cross multiply
    11,991.95x = 17,989.20 × 4,602.72
  4. Step 4: Simplify right side
    11,991.95x = 82,799,250.62
  5. Step 5: Solve for x
    x = 82,799,250.62/11,991.95
  6. Step 6: Final answer
    x = 6,904.57

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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.