Home / 3,990.28-5,500.88-2,807.68

Finding the Fourth Proportional to 3,990.28, 5,500.88 and 2,807.68

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Solution

The fourth proportional to 3,990.28, 5,500.88 and 2,807.68 is: 3,870.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.28 : 5,500.88 = 2,807.68 : x
  2. Step 2: Convert to fraction form
    3,990.28/5,500.88 = 2,807.68/x
  3. Step 3: Cross multiply
    3,990.28x = 5,500.88 × 2,807.68
  4. Step 4: Simplify right side
    3,990.28x = 15,444,710.76
  5. Step 5: Solve for x
    x = 15,444,710.76/3,990.28
  6. Step 6: Final answer
    x = 3,870.58

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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.