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Finding the Fourth Proportional to 1,369.38, 2,054.08 and 638.56

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Solution

The fourth proportional to 1,369.38, 2,054.08 and 638.56 is: 957.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.38 : 2,054.08 = 638.56 : x
  2. Step 2: Convert to fraction form
    1,369.38/2,054.08 = 638.56/x
  3. Step 3: Cross multiply
    1,369.38x = 2,054.08 × 638.56
  4. Step 4: Simplify right side
    1,369.38x = 1,311,653.32
  5. Step 5: Solve for x
    x = 1,311,653.32/1,369.38
  6. Step 6: Final answer
    x = 957.84

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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.