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Finding the Fourth Proportional to 228.30, 315.39 and 211.02

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Solution

The fourth proportional to 228.30, 315.39 and 211.02 is: 291.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.30 : 315.39 = 211.02 : x
  2. Step 2: Convert to fraction form
    228.30/315.39 = 211.02/x
  3. Step 3: Cross multiply
    228.30x = 315.39 × 211.02
  4. Step 4: Simplify right side
    228.30x = 66,553.60
  5. Step 5: Solve for x
    x = 66,553.60/228.30
  6. Step 6: Final answer
    x = 291.52

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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.