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Finding the Fourth Proportional to 120.64, 181.98 and 115.60

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Solution

The fourth proportional to 120.64, 181.98 and 115.60 is: 174.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.64 : 181.98 = 115.60 : x
  2. Step 2: Convert to fraction form
    120.64/181.98 = 115.60/x
  3. Step 3: Cross multiply
    120.64x = 181.98 × 115.60
  4. Step 4: Simplify right side
    120.64x = 21,036.89
  5. Step 5: Solve for x
    x = 21,036.89/120.64
  6. Step 6: Final answer
    x = 174.38

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.