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Finding the Fourth Proportional to 120.99, 181.36 and 47.86

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Solution

The fourth proportional to 120.99, 181.36 and 47.86 is: 71.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.99 : 181.36 = 47.86 : x
  2. Step 2: Convert to fraction form
    120.99/181.36 = 47.86/x
  3. Step 3: Cross multiply
    120.99x = 181.36 × 47.86
  4. Step 4: Simplify right side
    120.99x = 8,679.89
  5. Step 5: Solve for x
    x = 8,679.89/120.99
  6. Step 6: Final answer
    x = 71.74

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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.