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Finding the Fourth Proportional to 228.98, 315.72 and 189.50

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Solution

The fourth proportional to 228.98, 315.72 and 189.50 is: 261.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.98 : 315.72 = 189.50 : x
  2. Step 2: Convert to fraction form
    228.98/315.72 = 189.50/x
  3. Step 3: Cross multiply
    228.98x = 315.72 × 189.50
  4. Step 4: Simplify right side
    228.98x = 59,828.94
  5. Step 5: Solve for x
    x = 59,828.94/228.98
  6. Step 6: Final answer
    x = 261.28

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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.