Home / 5,228.20-7,215.42-2,990.40

Finding the Fourth Proportional to 5,228.20, 7,215.42 and 2,990.40

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Solution

The fourth proportional to 5,228.20, 7,215.42 and 2,990.40 is: 4,127.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,228.20 : 7,215.42 = 2,990.40 : x
  2. Step 2: Convert to fraction form
    5,228.20/7,215.42 = 2,990.40/x
  3. Step 3: Cross multiply
    5,228.20x = 7,215.42 × 2,990.40
  4. Step 4: Simplify right side
    5,228.20x = 21,576,991.97
  5. Step 5: Solve for x
    x = 21,576,991.97/5,228.20
  6. Step 6: Final answer
    x = 4,127.04

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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.