Home / 1,289.12-1,935.84-1,137.92

Finding the Fourth Proportional to 1,289.12, 1,935.84 and 1,137.92

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Solution

The fourth proportional to 1,289.12, 1,935.84 and 1,137.92 is: 1,708.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.12 : 1,935.84 = 1,137.92 : x
  2. Step 2: Convert to fraction form
    1,289.12/1,935.84 = 1,137.92/x
  3. Step 3: Cross multiply
    1,289.12x = 1,935.84 × 1,137.92
  4. Step 4: Simplify right side
    1,289.12x = 2,202,831.05
  5. Step 5: Solve for x
    x = 2,202,831.05/1,289.12
  6. Step 6: Final answer
    x = 1,708.79

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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.