Home / 2,129.02-3,190.57-811.41

Finding the Fourth Proportional to 2,129.02, 3,190.57 and 811.41

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Solution

The fourth proportional to 2,129.02, 3,190.57 and 811.41 is: 1,215.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.02 : 3,190.57 = 811.41 : x
  2. Step 2: Convert to fraction form
    2,129.02/3,190.57 = 811.41/x
  3. Step 3: Cross multiply
    2,129.02x = 3,190.57 × 811.41
  4. Step 4: Simplify right side
    2,129.02x = 2,588,860.40
  5. Step 5: Solve for x
    x = 2,588,860.40/2,129.02
  6. Step 6: Final answer
    x = 1,215.99

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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.