Home / 1,420.74-2,131.38-836.73

Finding the Fourth Proportional to 1,420.74, 2,131.38 and 836.73

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Solution

The fourth proportional to 1,420.74, 2,131.38 and 836.73 is: 1,255.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.74 : 2,131.38 = 836.73 : x
  2. Step 2: Convert to fraction form
    1,420.74/2,131.38 = 836.73/x
  3. Step 3: Cross multiply
    1,420.74x = 2,131.38 × 836.73
  4. Step 4: Simplify right side
    1,420.74x = 1,783,389.59
  5. Step 5: Solve for x
    x = 1,783,389.59/1,420.74
  6. Step 6: Final answer
    x = 1,255.25

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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.