Home / 2,990.85-4,126.68-1,811.67

Finding the Fourth Proportional to 2,990.85, 4,126.68 and 1,811.67

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Solution

The fourth proportional to 2,990.85, 4,126.68 and 1,811.67 is: 2,499.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.85 : 4,126.68 = 1,811.67 : x
  2. Step 2: Convert to fraction form
    2,990.85/4,126.68 = 1,811.67/x
  3. Step 3: Cross multiply
    2,990.85x = 4,126.68 × 1,811.67
  4. Step 4: Simplify right side
    2,990.85x = 7,476,182.36
  5. Step 5: Solve for x
    x = 7,476,182.36/2,990.85
  6. Step 6: Final answer
    x = 2,499.68

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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.