Home / 3,120.18-4,680.27-811.50

Finding the Fourth Proportional to 3,120.18, 4,680.27 and 811.50

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Solution

The fourth proportional to 3,120.18, 4,680.27 and 811.50 is: 1,217.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,120.18 : 4,680.27 = 811.50 : x
  2. Step 2: Convert to fraction form
    3,120.18/4,680.27 = 811.50/x
  3. Step 3: Cross multiply
    3,120.18x = 4,680.27 × 811.50
  4. Step 4: Simplify right side
    3,120.18x = 3,798,039.11
  5. Step 5: Solve for x
    x = 3,798,039.11/3,120.18
  6. Step 6: Final answer
    x = 1,217.25

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Double scale
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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.