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Finding the Fourth Proportional to 1,369.68, 2,053.56 and 638.82

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Solution

The fourth proportional to 1,369.68, 2,053.56 and 638.82 is: 957.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.68 : 2,053.56 = 638.82 : x
  2. Step 2: Convert to fraction form
    1,369.68/2,053.56 = 638.82/x
  3. Step 3: Cross multiply
    1,369.68x = 2,053.56 × 638.82
  4. Step 4: Simplify right side
    1,369.68x = 1,311,855.20
  5. Step 5: Solve for x
    x = 1,311,855.20/1,369.68
  6. Step 6: Final answer
    x = 957.78

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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.