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Finding the Fourth Proportional to 11,991.51, 17,992.94 and 5,419.71

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Solution

The fourth proportional to 11,991.51, 17,992.94 and 5,419.71 is: 8,132.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,991.51 : 17,992.94 = 5,419.71 : x
  2. Step 2: Convert to fraction form
    11,991.51/17,992.94 = 5,419.71/x
  3. Step 3: Cross multiply
    11,991.51x = 17,992.94 × 5,419.71
  4. Step 4: Simplify right side
    11,991.51x = 97,516,489.75
  5. Step 5: Solve for x
    x = 97,516,489.75/11,991.51
  6. Step 6: Final answer
    x = 8,132.13

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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.