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Finding the Fourth Proportional to 79,816.84, 119,715.48 and 20,647.60

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Solution

The fourth proportional to 79,816.84, 119,715.48 and 20,647.60 is: 30,968.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,816.84 : 119,715.48 = 20,647.60 : x
  2. Step 2: Convert to fraction form
    79,816.84/119,715.48 = 20,647.60/x
  3. Step 3: Cross multiply
    79,816.84x = 119,715.48 × 20,647.60
  4. Step 4: Simplify right side
    79,816.84x = 2,471,837,344.85
  5. Step 5: Solve for x
    x = 2,471,837,344.85/79,816.84
  6. Step 6: Final answer
    x = 30,968.87

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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.