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Finding the Fourth Proportional to 228.69, 342.72 and 120.55

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Solution

The fourth proportional to 228.69, 342.72 and 120.55 is: 180.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.69 : 342.72 = 120.55 : x
  2. Step 2: Convert to fraction form
    228.69/342.72 = 120.55/x
  3. Step 3: Cross multiply
    228.69x = 342.72 × 120.55
  4. Step 4: Simplify right side
    228.69x = 41,314.90
  5. Step 5: Solve for x
    x = 41,314.90/228.69
  6. Step 6: Final answer
    x = 180.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.