Home / 2,990.21-4,126.68-1,997.15

Finding the Fourth Proportional to 2,990.21, 4,126.68 and 1,997.15

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Solution

The fourth proportional to 2,990.21, 4,126.68 and 1,997.15 is: 2,756.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.21 : 4,126.68 = 1,997.15 : x
  2. Step 2: Convert to fraction form
    2,990.21/4,126.68 = 1,997.15/x
  3. Step 3: Cross multiply
    2,990.21x = 4,126.68 × 1,997.15
  4. Step 4: Simplify right side
    2,990.21x = 8,241,568.34
  5. Step 5: Solve for x
    x = 8,241,568.34/2,990.21
  6. Step 6: Final answer
    x = 2,756.19

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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.