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Finding the Fourth Proportional to 120.64, 181.02 and 84.40

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Solution

The fourth proportional to 120.64, 181.02 and 84.40 is: 126.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.64 : 181.02 = 84.40 : x
  2. Step 2: Convert to fraction form
    120.64/181.02 = 84.40/x
  3. Step 3: Cross multiply
    120.64x = 181.02 × 84.40
  4. Step 4: Simplify right side
    120.64x = 15,278.09
  5. Step 5: Solve for x
    x = 15,278.09/120.64
  6. Step 6: Final answer
    x = 126.64

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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.