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Finding the Fourth Proportional to 1,396.74, 2,095.57 and 519.72

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Solution

The fourth proportional to 1,396.74, 2,095.57 and 519.72 is: 779.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.74 : 2,095.57 = 519.72 : x
  2. Step 2: Convert to fraction form
    1,396.74/2,095.57 = 519.72/x
  3. Step 3: Cross multiply
    1,396.74x = 2,095.57 × 519.72
  4. Step 4: Simplify right side
    1,396.74x = 1,089,102.43
  5. Step 5: Solve for x
    x = 1,089,102.43/1,396.74
  6. Step 6: Final answer
    x = 779.74

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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.