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Finding the Fourth Proportional to 11,991.90, 17,992.53 and 7,612.86

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Solution

The fourth proportional to 11,991.90, 17,992.53 and 7,612.86 is: 11,422.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,991.90 : 17,992.53 = 7,612.86 : x
  2. Step 2: Convert to fraction form
    11,991.90/17,992.53 = 7,612.86/x
  3. Step 3: Cross multiply
    11,991.90x = 17,992.53 × 7,612.86
  4. Step 4: Simplify right side
    11,991.90x = 136,974,611.94
  5. Step 5: Solve for x
    x = 136,974,611.94/11,991.90
  6. Step 6: Final answer
    x = 11,422.26

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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.