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Finding the Fourth Proportional to 1,368.28, 2,052.42 and 638.20

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Solution

The fourth proportional to 1,368.28, 2,052.42 and 638.20 is: 957.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368.28 : 2,052.42 = 638.20 : x
  2. Step 2: Convert to fraction form
    1,368.28/2,052.42 = 638.20/x
  3. Step 3: Cross multiply
    1,368.28x = 2,052.42 × 638.20
  4. Step 4: Simplify right side
    1,368.28x = 1,309,854.44
  5. Step 5: Solve for x
    x = 1,309,854.44/1,368.28
  6. Step 6: Final answer
    x = 957.30

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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.