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Finding the Fourth Proportional to 18,991.62, 28,415.15 and 11,467.49

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Solution

The fourth proportional to 18,991.62, 28,415.15 and 11,467.49 is: 17,157.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.62 : 28,415.15 = 11,467.49 : x
  2. Step 2: Convert to fraction form
    18,991.62/28,415.15 = 11,467.49/x
  3. Step 3: Cross multiply
    18,991.62x = 28,415.15 × 11,467.49
  4. Step 4: Simplify right side
    18,991.62x = 325,850,306.40
  5. Step 5: Solve for x
    x = 325,850,306.40/18,991.62
  6. Step 6: Final answer
    x = 17,157.58

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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.