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Finding the Fourth Proportional to 2,651.40, 3,974.40 and 1,555.20

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Solution

The fourth proportional to 2,651.40, 3,974.40 and 1,555.20 is: 2,331.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,651.40 : 3,974.40 = 1,555.20 : x
  2. Step 2: Convert to fraction form
    2,651.40/3,974.40 = 1,555.20/x
  3. Step 3: Cross multiply
    2,651.40x = 3,974.40 × 1,555.20
  4. Step 4: Simplify right side
    2,651.40x = 6,180,986.88
  5. Step 5: Solve for x
    x = 6,180,986.88/2,651.40
  6. Step 6: Final answer
    x = 2,331.22

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Similar ratio
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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.