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Finding the Fourth Proportional to 1,399.60, 1,929.60 and 1,163.74

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Solution

The fourth proportional to 1,399.60, 1,929.60 and 1,163.74 is: 1,604.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.60 : 1,929.60 = 1,163.74 : x
  2. Step 2: Convert to fraction form
    1,399.60/1,929.60 = 1,163.74/x
  3. Step 3: Cross multiply
    1,399.60x = 1,929.60 × 1,163.74
  4. Step 4: Simplify right side
    1,399.60x = 2,245,552.70
  5. Step 5: Solve for x
    x = 2,245,552.70/1,399.60
  6. Step 6: Final answer
    x = 1,604.42

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1.5x scale

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.