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Finding the Fourth Proportional to 2,759.40, 4,137.90 and 811.20

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Solution

The fourth proportional to 2,759.40, 4,137.90 and 811.20 is: 1,216.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,759.40 : 4,137.90 = 811.20 : x
  2. Step 2: Convert to fraction form
    2,759.40/4,137.90 = 811.20/x
  3. Step 3: Cross multiply
    2,759.40x = 4,137.90 × 811.20
  4. Step 4: Simplify right side
    2,759.40x = 3,356,664.48
  5. Step 5: Solve for x
    x = 3,356,664.48/2,759.40
  6. Step 6: Final answer
    x = 1,216.45

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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.