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Finding the Fourth Proportional to 19,321.90, 29,015.90 and 11,869.15

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Solution

The fourth proportional to 19,321.90, 29,015.90 and 11,869.15 is: 17,824.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,321.90 : 29,015.90 = 11,869.15 : x
  2. Step 2: Convert to fraction form
    19,321.90/29,015.90 = 11,869.15/x
  3. Step 3: Cross multiply
    19,321.90x = 29,015.90 × 11,869.15
  4. Step 4: Simplify right side
    19,321.90x = 344,394,010.14
  5. Step 5: Solve for x
    x = 344,394,010.14/19,321.90
  6. Step 6: Final answer
    x = 17,824.02

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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.