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Finding the Fourth Proportional to 228.96, 315.89 and 135.68

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Solution

The fourth proportional to 228.96, 315.89 and 135.68 is: 187.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.96 : 315.89 = 135.68 : x
  2. Step 2: Convert to fraction form
    228.96/315.89 = 135.68/x
  3. Step 3: Cross multiply
    228.96x = 315.89 × 135.68
  4. Step 4: Simplify right side
    228.96x = 42,857.70
  5. Step 5: Solve for x
    x = 42,857.70/228.96
  6. Step 6: Final answer
    x = 187.18

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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.