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Finding the Fourth Proportional to 145.15, 200.09 and 103.68

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Solution

The fourth proportional to 145.15, 200.09 and 103.68 is: 142.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.15 : 200.09 = 103.68 : x
  2. Step 2: Convert to fraction form
    145.15/200.09 = 103.68/x
  3. Step 3: Cross multiply
    145.15x = 200.09 × 103.68
  4. Step 4: Simplify right side
    145.15x = 20,745.33
  5. Step 5: Solve for x
    x = 20,745.33/145.15
  6. Step 6: Final answer
    x = 142.92

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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.