Home / 1,290.30-1,936.14-1,220.61

Finding the Fourth Proportional to 1,290.30, 1,936.14 and 1,220.61

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Solution

The fourth proportional to 1,290.30, 1,936.14 and 1,220.61 is: 1,831.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.30 : 1,936.14 = 1,220.61 : x
  2. Step 2: Convert to fraction form
    1,290.30/1,936.14 = 1,220.61/x
  3. Step 3: Cross multiply
    1,290.30x = 1,936.14 × 1,220.61
  4. Step 4: Simplify right side
    1,290.30x = 2,363,271.85
  5. Step 5: Solve for x
    x = 2,363,271.85/1,290.30
  6. Step 6: Final answer
    x = 1,831.57

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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.