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Finding the Fourth Proportional to 1,200.90, 1,800.90 and 834.60

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Solution

The fourth proportional to 1,200.90, 1,800.90 and 834.60 is: 1,251.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.90 : 1,800.90 = 834.60 : x
  2. Step 2: Convert to fraction form
    1,200.90/1,800.90 = 834.60/x
  3. Step 3: Cross multiply
    1,200.90x = 1,800.90 × 834.60
  4. Step 4: Simplify right side
    1,200.90x = 1,503,031.14
  5. Step 5: Solve for x
    x = 1,503,031.14/1,200.90
  6. Step 6: Final answer
    x = 1,251.59

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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.