Home / 3,120.09-4,680.05-811.59

Finding the Fourth Proportional to 3,120.09, 4,680.05 and 811.59

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Solution

The fourth proportional to 3,120.09, 4,680.05 and 811.59 is: 1,217.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,120.09 : 4,680.05 = 811.59 : x
  2. Step 2: Convert to fraction form
    3,120.09/4,680.05 = 811.59/x
  3. Step 3: Cross multiply
    3,120.09x = 4,680.05 × 811.59
  4. Step 4: Simplify right side
    3,120.09x = 3,798,277.72
  5. Step 5: Solve for x
    x = 3,798,277.72/3,120.09
  6. Step 6: Final answer
    x = 1,217.36

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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.