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Finding the Fourth Proportional to 1,339.74, 2,005.23 and 1,211.86

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Solution

The fourth proportional to 1,339.74, 2,005.23 and 1,211.86 is: 1,813.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.74 : 2,005.23 = 1,211.86 : x
  2. Step 2: Convert to fraction form
    1,339.74/2,005.23 = 1,211.86/x
  3. Step 3: Cross multiply
    1,339.74x = 2,005.23 × 1,211.86
  4. Step 4: Simplify right side
    1,339.74x = 2,430,065.08
  5. Step 5: Solve for x
    x = 2,430,065.08/1,339.74
  6. Step 6: Final answer
    x = 1,813.83

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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.