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Finding the Fourth Proportional to 120.72, 181.01 and 52.20

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Solution

The fourth proportional to 120.72, 181.01 and 52.20 is: 78.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.72 : 181.01 = 52.20 : x
  2. Step 2: Convert to fraction form
    120.72/181.01 = 52.20/x
  3. Step 3: Cross multiply
    120.72x = 181.01 × 52.20
  4. Step 4: Simplify right side
    120.72x = 9,448.46
  5. Step 5: Solve for x
    x = 9,448.46/120.72
  6. Step 6: Final answer
    x = 78.27

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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.