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Finding the Fourth Proportional to 168.78, 253.20 and 66.12

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Solution

The fourth proportional to 168.78, 253.20 and 66.12 is: 99.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.78 : 253.20 = 66.12 : x
  2. Step 2: Convert to fraction form
    168.78/253.20 = 66.12/x
  3. Step 3: Cross multiply
    168.78x = 253.20 × 66.12
  4. Step 4: Simplify right side
    168.78x = 16,741.58
  5. Step 5: Solve for x
    x = 16,741.58/168.78
  6. Step 6: Final answer
    x = 99.19

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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.