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Finding the Fourth Proportional to 228.66, 315.49 and 135.39

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Solution

The fourth proportional to 228.66, 315.49 and 135.39 is: 186.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.66 : 315.49 = 135.39 : x
  2. Step 2: Convert to fraction form
    228.66/315.49 = 135.39/x
  3. Step 3: Cross multiply
    228.66x = 315.49 × 135.39
  4. Step 4: Simplify right side
    228.66x = 42,714.19
  5. Step 5: Solve for x
    x = 42,714.19/228.66
  6. Step 6: Final answer
    x = 186.80

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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.