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Finding the Fourth Proportional to 18,991.80, 28,487.70 and 5,140.80

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Solution

The fourth proportional to 18,991.80, 28,487.70 and 5,140.80 is: 7,711.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.80 : 28,487.70 = 5,140.80 : x
  2. Step 2: Convert to fraction form
    18,991.80/28,487.70 = 5,140.80/x
  3. Step 3: Cross multiply
    18,991.80x = 28,487.70 × 5,140.80
  4. Step 4: Simplify right side
    18,991.80x = 146,449,568.16
  5. Step 5: Solve for x
    x = 146,449,568.16/18,991.80
  6. Step 6: Final answer
    x = 7,711.20

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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.