Home / 2,831.10-4,239.80-1,440.78

Finding the Fourth Proportional to 2,831.10, 4,239.80 and 1,440.78

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Solution

The fourth proportional to 2,831.10, 4,239.80 and 1,440.78 is: 2,157.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,831.10 : 4,239.80 = 1,440.78 : x
  2. Step 2: Convert to fraction form
    2,831.10/4,239.80 = 1,440.78/x
  3. Step 3: Cross multiply
    2,831.10x = 4,239.80 × 1,440.78
  4. Step 4: Simplify right side
    2,831.10x = 6,108,619.04
  5. Step 5: Solve for x
    x = 6,108,619.04/2,831.10
  6. Step 6: Final answer
    x = 2,157.68

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1.5x scale

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.