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Finding the Fourth Proportional to 1,379.72, 2,069.53 and 339.73

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Solution

The fourth proportional to 1,379.72, 2,069.53 and 339.73 is: 509.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.72 : 2,069.53 = 339.73 : x
  2. Step 2: Convert to fraction form
    1,379.72/2,069.53 = 339.73/x
  3. Step 3: Cross multiply
    1,379.72x = 2,069.53 × 339.73
  4. Step 4: Simplify right side
    1,379.72x = 703,081.43
  5. Step 5: Solve for x
    x = 703,081.43/1,379.72
  6. Step 6: Final answer
    x = 509.58

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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.