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Finding the Fourth Proportional to 1,201.94, 1,658.86 and 1,005.38

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Solution

The fourth proportional to 1,201.94, 1,658.86 and 1,005.38 is: 1,387.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,201.94 : 1,658.86 = 1,005.38 : x
  2. Step 2: Convert to fraction form
    1,201.94/1,658.86 = 1,005.38/x
  3. Step 3: Cross multiply
    1,201.94x = 1,658.86 × 1,005.38
  4. Step 4: Simplify right side
    1,201.94x = 1,667,776.37
  5. Step 5: Solve for x
    x = 1,667,776.37/1,201.94
  6. Step 6: Final answer
    x = 1,387.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.