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Finding the Fourth Proportional to 18,991.44, 28,487.16 and 5,140.44

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Solution

The fourth proportional to 18,991.44, 28,487.16 and 5,140.44 is: 7,710.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.44 : 28,487.16 = 5,140.44 : x
  2. Step 2: Convert to fraction form
    18,991.44/28,487.16 = 5,140.44/x
  3. Step 3: Cross multiply
    18,991.44x = 28,487.16 × 5,140.44
  4. Step 4: Simplify right side
    18,991.44x = 146,436,536.75
  5. Step 5: Solve for x
    x = 146,436,536.75/18,991.44
  6. Step 6: Final answer
    x = 7,710.66

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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.