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Finding the Fourth Proportional to 228.31, 315.09 and 145.42

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Solution

The fourth proportional to 228.31, 315.09 and 145.42 is: 200.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.31 : 315.09 = 145.42 : x
  2. Step 2: Convert to fraction form
    228.31/315.09 = 145.42/x
  3. Step 3: Cross multiply
    228.31x = 315.09 × 145.42
  4. Step 4: Simplify right side
    228.31x = 45,820.39
  5. Step 5: Solve for x
    x = 45,820.39/228.31
  6. Step 6: Final answer
    x = 200.69

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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.