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Finding the Fourth Proportional to 168.40, 253.14 and 120.64

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Solution

The fourth proportional to 168.40, 253.14 and 120.64 is: 181.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.40 : 253.14 = 120.64 : x
  2. Step 2: Convert to fraction form
    168.40/253.14 = 120.64/x
  3. Step 3: Cross multiply
    168.40x = 253.14 × 120.64
  4. Step 4: Simplify right side
    168.40x = 30,538.81
  5. Step 5: Solve for x
    x = 30,538.81/168.40
  6. Step 6: Final answer
    x = 181.35

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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.