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Finding the Fourth Proportional to 228.85, 343.28 and 66.55

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Solution

The fourth proportional to 228.85, 343.28 and 66.55 is: 99.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.85 : 343.28 = 66.55 : x
  2. Step 2: Convert to fraction form
    228.85/343.28 = 66.55/x
  3. Step 3: Cross multiply
    228.85x = 343.28 × 66.55
  4. Step 4: Simplify right side
    228.85x = 22,844.34
  5. Step 5: Solve for x
    x = 22,844.34/228.85
  6. Step 6: Final answer
    x = 99.82

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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.