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Finding the Fourth Proportional to 120.74, 181.06 and 47.59

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Solution

The fourth proportional to 120.74, 181.06 and 47.59 is: 71.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.74 : 181.06 = 47.59 : x
  2. Step 2: Convert to fraction form
    120.74/181.06 = 47.59/x
  3. Step 3: Cross multiply
    120.74x = 181.06 × 47.59
  4. Step 4: Simplify right side
    120.74x = 8,616.65
  5. Step 5: Solve for x
    x = 8,616.65/120.74
  6. Step 6: Final answer
    x = 71.37

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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.