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Finding the Fourth Proportional to 120.68, 181.11 and 90.32

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Solution

The fourth proportional to 120.68, 181.11 and 90.32 is: 135.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.68 : 181.11 = 90.32 : x
  2. Step 2: Convert to fraction form
    120.68/181.11 = 90.32/x
  3. Step 3: Cross multiply
    120.68x = 181.11 × 90.32
  4. Step 4: Simplify right side
    120.68x = 16,357.86
  5. Step 5: Solve for x
    x = 16,357.86/120.68
  6. Step 6: Final answer
    x = 135.55

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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.