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Finding the Fourth Proportional to 168.55, 253.21 and 145.49

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Solution

The fourth proportional to 168.55, 253.21 and 145.49 is: 218.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.55 : 253.21 = 145.49 : x
  2. Step 2: Convert to fraction form
    168.55/253.21 = 145.49/x
  3. Step 3: Cross multiply
    168.55x = 253.21 × 145.49
  4. Step 4: Simplify right side
    168.55x = 36,837.89
  5. Step 5: Solve for x
    x = 36,837.89/168.55
  6. Step 6: Final answer
    x = 218.56

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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.