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Finding the Fourth Proportional to 1,226.73, 1,690.62 and 1,039.62

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Solution

The fourth proportional to 1,226.73, 1,690.62 and 1,039.62 is: 1,432.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.73 : 1,690.62 = 1,039.62 : x
  2. Step 2: Convert to fraction form
    1,226.73/1,690.62 = 1,039.62/x
  3. Step 3: Cross multiply
    1,226.73x = 1,690.62 × 1,039.62
  4. Step 4: Simplify right side
    1,226.73x = 1,757,602.36
  5. Step 5: Solve for x
    x = 1,757,602.36/1,226.73
  6. Step 6: Final answer
    x = 1,432.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.