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Finding the Fourth Proportional to 1,368.65, 2,052.36 and 638.44

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Solution

The fourth proportional to 1,368.65, 2,052.36 and 638.44 is: 957.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368.65 : 2,052.36 = 638.44 : x
  2. Step 2: Convert to fraction form
    1,368.65/2,052.36 = 638.44/x
  3. Step 3: Cross multiply
    1,368.65x = 2,052.36 × 638.44
  4. Step 4: Simplify right side
    1,368.65x = 1,310,303.59
  5. Step 5: Solve for x
    x = 1,310,303.59/1,368.65
  6. Step 6: Final answer
    x = 957.37

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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.