Home / 3,119.55-4,679.34-811.05

Finding the Fourth Proportional to 3,119.55, 4,679.34 and 811.05

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Solution

The fourth proportional to 3,119.55, 4,679.34 and 811.05 is: 1,216.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,119.55 : 4,679.34 = 811.05 : x
  2. Step 2: Convert to fraction form
    3,119.55/4,679.34 = 811.05/x
  3. Step 3: Cross multiply
    3,119.55x = 4,679.34 × 811.05
  4. Step 4: Simplify right side
    3,119.55x = 3,795,178.71
  5. Step 5: Solve for x
    x = 3,795,178.71/3,119.55
  6. Step 6: Final answer
    x = 1,216.58

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Double scale
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Similar ratio
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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.