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Finding the Fourth Proportional to 1,243.47, 1,861.39 and 779.64

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Solution

The fourth proportional to 1,243.47, 1,861.39 and 779.64 is: 1,167.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.47 : 1,861.39 = 779.64 : x
  2. Step 2: Convert to fraction form
    1,243.47/1,861.39 = 779.64/x
  3. Step 3: Cross multiply
    1,243.47x = 1,861.39 × 779.64
  4. Step 4: Simplify right side
    1,243.47x = 1,451,214.10
  5. Step 5: Solve for x
    x = 1,451,214.10/1,243.47
  6. Step 6: Final answer
    x = 1,167.07

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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.