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Finding the Fourth Proportional to 5,278.99, 7,910.27 and 1,990.28

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Solution

The fourth proportional to 5,278.99, 7,910.27 and 1,990.28 is: 2,982.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,278.99 : 7,910.27 = 1,990.28 : x
  2. Step 2: Convert to fraction form
    5,278.99/7,910.27 = 1,990.28/x
  3. Step 3: Cross multiply
    5,278.99x = 7,910.27 × 1,990.28
  4. Step 4: Simplify right side
    5,278.99x = 15,743,642.22
  5. Step 5: Solve for x
    x = 15,743,642.22/5,278.99
  6. Step 6: Final answer
    x = 2,982.32

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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.