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Finding the Fourth Proportional to 1,179.70, 1,769.81 and 399.67

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Solution

The fourth proportional to 1,179.70, 1,769.81 and 399.67 is: 599.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,179.70 : 1,769.81 = 399.67 : x
  2. Step 2: Convert to fraction form
    1,179.70/1,769.81 = 399.67/x
  3. Step 3: Cross multiply
    1,179.70x = 1,769.81 × 399.67
  4. Step 4: Simplify right side
    1,179.70x = 707,329.12
  5. Step 5: Solve for x
    x = 707,329.12/1,179.70
  6. Step 6: Final answer
    x = 599.58

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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.