Home / 3,131.19-4,321.22-1,787.20

Finding the Fourth Proportional to 3,131.19, 4,321.22 and 1,787.20

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Solution

The fourth proportional to 3,131.19, 4,321.22 and 1,787.20 is: 2,466.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,131.19 : 4,321.22 = 1,787.20 : x
  2. Step 2: Convert to fraction form
    3,131.19/4,321.22 = 1,787.20/x
  3. Step 3: Cross multiply
    3,131.19x = 4,321.22 × 1,787.20
  4. Step 4: Simplify right side
    3,131.19x = 7,722,864.64
  5. Step 5: Solve for x
    x = 7,722,864.64/3,131.19
  6. Step 6: Final answer
    x = 2,466.43

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Half scale
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Double scale
Find fourth proportional to 3,132.19, 4,322.60 and 1,788.20
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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.