Home / 5,115.40-7,057.04-2,990.80

Finding the Fourth Proportional to 5,115.40, 7,057.04 and 2,990.80

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Solution

The fourth proportional to 5,115.40, 7,057.04 and 2,990.80 is: 4,126.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,115.40 : 7,057.04 = 2,990.80 : x
  2. Step 2: Convert to fraction form
    5,115.40/7,057.04 = 2,990.80/x
  3. Step 3: Cross multiply
    5,115.40x = 7,057.04 × 2,990.80
  4. Step 4: Simplify right side
    5,115.40x = 21,106,195.23
  5. Step 5: Solve for x
    x = 21,106,195.23/5,115.40
  6. Step 6: Final answer
    x = 4,126.01

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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.