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Finding the Fourth Proportional to 1,226.60, 1,841.21 and 679.85

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Solution

The fourth proportional to 1,226.60, 1,841.21 and 679.85 is: 1,020.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.60 : 1,841.21 = 679.85 : x
  2. Step 2: Convert to fraction form
    1,226.60/1,841.21 = 679.85/x
  3. Step 3: Cross multiply
    1,226.60x = 1,841.21 × 679.85
  4. Step 4: Simplify right side
    1,226.60x = 1,251,746.62
  5. Step 5: Solve for x
    x = 1,251,746.62/1,226.60
  6. Step 6: Final answer
    x = 1,020.50

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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.