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Finding the Fourth Proportional to 18,975.62, 28,448.80 and 7,129.14

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Solution

The fourth proportional to 18,975.62, 28,448.80 and 7,129.14 is: 10,688.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,975.62 : 28,448.80 = 7,129.14 : x
  2. Step 2: Convert to fraction form
    18,975.62/28,448.80 = 7,129.14/x
  3. Step 3: Cross multiply
    18,975.62x = 28,448.80 × 7,129.14
  4. Step 4: Simplify right side
    18,975.62x = 202,815,478.03
  5. Step 5: Solve for x
    x = 202,815,478.03/18,975.62
  6. Step 6: Final answer
    x = 10,688.21

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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.