Home / 1,890.80-2,831.40-1,401.20

Finding the Fourth Proportional to 1,890.80, 2,831.40 and 1,401.20

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Solution

The fourth proportional to 1,890.80, 2,831.40 and 1,401.20 is: 2,098.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,890.80 : 2,831.40 = 1,401.20 : x
  2. Step 2: Convert to fraction form
    1,890.80/2,831.40 = 1,401.20/x
  3. Step 3: Cross multiply
    1,890.80x = 2,831.40 × 1,401.20
  4. Step 4: Simplify right side
    1,890.80x = 3,967,357.68
  5. Step 5: Solve for x
    x = 3,967,357.68/1,890.80
  6. Step 6: Final answer
    x = 2,098.24

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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.