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Finding the Fourth Proportional to 2,628.05, 3,926.81 and 1,990.58

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Solution

The fourth proportional to 2,628.05, 3,926.81 and 1,990.58 is: 2,974.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,628.05 : 3,926.81 = 1,990.58 : x
  2. Step 2: Convert to fraction form
    2,628.05/3,926.81 = 1,990.58/x
  3. Step 3: Cross multiply
    2,628.05x = 3,926.81 × 1,990.58
  4. Step 4: Simplify right side
    2,628.05x = 7,816,614.79
  5. Step 5: Solve for x
    x = 7,816,614.79/2,628.05
  6. Step 6: Final answer
    x = 2,974.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.