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Finding the Fourth Proportional to 228.63, 315.57 and 135.42

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Solution

The fourth proportional to 228.63, 315.57 and 135.42 is: 186.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.63 : 315.57 = 135.42 : x
  2. Step 2: Convert to fraction form
    228.63/315.57 = 135.42/x
  3. Step 3: Cross multiply
    228.63x = 315.57 × 135.42
  4. Step 4: Simplify right side
    228.63x = 42,734.49
  5. Step 5: Solve for x
    x = 42,734.49/228.63
  6. Step 6: Final answer
    x = 186.92

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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.