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Finding the Fourth Proportional to 1,179.69, 1,770.21 and 486.23

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Solution

The fourth proportional to 1,179.69, 1,770.21 and 486.23 is: 729.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,179.69 : 1,770.21 = 486.23 : x
  2. Step 2: Convert to fraction form
    1,179.69/1,770.21 = 486.23/x
  3. Step 3: Cross multiply
    1,179.69x = 1,770.21 × 486.23
  4. Step 4: Simplify right side
    1,179.69x = 860,720.36
  5. Step 5: Solve for x
    x = 860,720.36/1,179.69
  6. Step 6: Final answer
    x = 729.62

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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.