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Finding the Fourth Proportional to 3,390, 5,085.90 and 1,081.50

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Solution

The fourth proportional to 3,390, 5,085.90 and 1,081.50 is: 1,622.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,390 : 5,085.90 = 1,081.50 : x
  2. Step 2: Convert to fraction form
    3,390/5,085.90 = 1,081.50/x
  3. Step 3: Cross multiply
    3,390x = 5,085.90 × 1,081.50
  4. Step 4: Simplify right side
    3,390x = 5,500,400.85
  5. Step 5: Solve for x
    x = 5,500,400.85/3,390
  6. Step 6: Final answer
    x = 1,622.54

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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.