Home / 3,121.71-4,308.21-1,863.15

Finding the Fourth Proportional to 3,121.71, 4,308.21 and 1,863.15

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Solution

The fourth proportional to 3,121.71, 4,308.21 and 1,863.15 is: 2,571.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.71 : 4,308.21 = 1,863.15 : x
  2. Step 2: Convert to fraction form
    3,121.71/4,308.21 = 1,863.15/x
  3. Step 3: Cross multiply
    3,121.71x = 4,308.21 × 1,863.15
  4. Step 4: Simplify right side
    3,121.71x = 8,026,841.46
  5. Step 5: Solve for x
    x = 8,026,841.46/3,121.71
  6. Step 6: Final answer
    x = 2,571.30

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.