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Finding the Fourth Proportional to 203.78, 305.68 and 145.86

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Solution

The fourth proportional to 203.78, 305.68 and 145.86 is: 218.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.78 : 305.68 = 145.86 : x
  2. Step 2: Convert to fraction form
    203.78/305.68 = 145.86/x
  3. Step 3: Cross multiply
    203.78x = 305.68 × 145.86
  4. Step 4: Simplify right side
    203.78x = 44,586.48
  5. Step 5: Solve for x
    x = 44,586.48/203.78
  6. Step 6: Final answer
    x = 218.80

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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.