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Finding the Fourth Proportional to 1,211.82, 1,819.32 and 719.13

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Solution

The fourth proportional to 1,211.82, 1,819.32 and 719.13 is: 1,079.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.82 : 1,819.32 = 719.13 : x
  2. Step 2: Convert to fraction form
    1,211.82/1,819.32 = 719.13/x
  3. Step 3: Cross multiply
    1,211.82x = 1,819.32 × 719.13
  4. Step 4: Simplify right side
    1,211.82x = 1,308,327.59
  5. Step 5: Solve for x
    x = 1,308,327.59/1,211.82
  6. Step 6: Final answer
    x = 1,079.64

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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.