Home / 3,618.40-4,991.20-2,291.20

Finding the Fourth Proportional to 3,618.40, 4,991.20 and 2,291.20

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Solution

The fourth proportional to 3,618.40, 4,991.20 and 2,291.20 is: 3,160.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,618.40 : 4,991.20 = 2,291.20 : x
  2. Step 2: Convert to fraction form
    3,618.40/4,991.20 = 2,291.20/x
  3. Step 3: Cross multiply
    3,618.40x = 4,991.20 × 2,291.20
  4. Step 4: Simplify right side
    3,618.40x = 11,435,837.44
  5. Step 5: Solve for x
    x = 11,435,837.44/3,618.40
  6. Step 6: Final answer
    x = 3,160.47

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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.