Home / 1,311.30-1,812.96-1,200.60

Finding the Fourth Proportional to 1,311.30, 1,812.96 and 1,200.60

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Solution

The fourth proportional to 1,311.30, 1,812.96 and 1,200.60 is: 1,659.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.30 : 1,812.96 = 1,200.60 : x
  2. Step 2: Convert to fraction form
    1,311.30/1,812.96 = 1,200.60/x
  3. Step 3: Cross multiply
    1,311.30x = 1,812.96 × 1,200.60
  4. Step 4: Simplify right side
    1,311.30x = 2,176,639.78
  5. Step 5: Solve for x
    x = 2,176,639.78/1,311.30
  6. Step 6: Final answer
    x = 1,659.91

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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.