Home / 3,120.19-4,680.59-811.69

Finding the Fourth Proportional to 3,120.19, 4,680.59 and 811.69

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Solution

The fourth proportional to 3,120.19, 4,680.59 and 811.69 is: 1,217.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,120.19 : 4,680.59 = 811.69 : x
  2. Step 2: Convert to fraction form
    3,120.19/4,680.59 = 811.69/x
  3. Step 3: Cross multiply
    3,120.19x = 4,680.59 × 811.69
  4. Step 4: Simplify right side
    3,120.19x = 3,799,172.34
  5. Step 5: Solve for x
    x = 3,799,172.34/3,120.19
  6. Step 6: Final answer
    x = 1,217.61

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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.