Home / 2,756.19-4,128.81-1,290.90

Finding the Fourth Proportional to 2,756.19, 4,128.81 and 1,290.90

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Solution

The fourth proportional to 2,756.19, 4,128.81 and 1,290.90 is: 1,933.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,756.19 : 4,128.81 = 1,290.90 : x
  2. Step 2: Convert to fraction form
    2,756.19/4,128.81 = 1,290.90/x
  3. Step 3: Cross multiply
    2,756.19x = 4,128.81 × 1,290.90
  4. Step 4: Simplify right side
    2,756.19x = 5,329,880.83
  5. Step 5: Solve for x
    x = 5,329,880.83/2,756.19
  6. Step 6: Final answer
    x = 1,933.79

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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.