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Finding the Fourth Proportional to 20,389.69, 30,593.04 and 7,918.39

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Solution

The fourth proportional to 20,389.69, 30,593.04 and 7,918.39 is: 11,880.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,389.69 : 30,593.04 = 7,918.39 : x
  2. Step 2: Convert to fraction form
    20,389.69/30,593.04 = 7,918.39/x
  3. Step 3: Cross multiply
    20,389.69x = 30,593.04 × 7,918.39
  4. Step 4: Simplify right side
    20,389.69x = 242,247,622.01
  5. Step 5: Solve for x
    x = 242,247,622.01/20,389.69
  6. Step 6: Final answer
    x = 11,880.89

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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.