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Finding the Fourth Proportional to 1,185.92, 1,778.88 and 638.24

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Solution

The fourth proportional to 1,185.92, 1,778.88 and 638.24 is: 957.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.92 : 1,778.88 = 638.24 : x
  2. Step 2: Convert to fraction form
    1,185.92/1,778.88 = 638.24/x
  3. Step 3: Cross multiply
    1,185.92x = 1,778.88 × 638.24
  4. Step 4: Simplify right side
    1,185.92x = 1,135,352.37
  5. Step 5: Solve for x
    x = 1,135,352.37/1,185.92
  6. Step 6: Final answer
    x = 957.36

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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.