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Finding the Fourth Proportional to 1,379.70, 2,069.82 and 514.62

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Solution

The fourth proportional to 1,379.70, 2,069.82 and 514.62 is: 772.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.70 : 2,069.82 = 514.62 : x
  2. Step 2: Convert to fraction form
    1,379.70/2,069.82 = 514.62/x
  3. Step 3: Cross multiply
    1,379.70x = 2,069.82 × 514.62
  4. Step 4: Simplify right side
    1,379.70x = 1,065,170.77
  5. Step 5: Solve for x
    x = 1,065,170.77/1,379.70
  6. Step 6: Final answer
    x = 772.03

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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.