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Finding the Fourth Proportional to 228.96, 315.96 and 135.75

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Solution

The fourth proportional to 228.96, 315.96 and 135.75 is: 187.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.96 : 315.96 = 135.75 : x
  2. Step 2: Convert to fraction form
    228.96/315.96 = 135.75/x
  3. Step 3: Cross multiply
    228.96x = 315.96 × 135.75
  4. Step 4: Simplify right side
    228.96x = 42,892.08
  5. Step 5: Solve for x
    x = 42,892.08/228.96
  6. Step 6: Final answer
    x = 187.34

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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.