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Finding the Fourth Proportional to 325.65, 488.54 and 120.20

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Solution

The fourth proportional to 325.65, 488.54 and 120.20 is: 180.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.65 : 488.54 = 120.20 : x
  2. Step 2: Convert to fraction form
    325.65/488.54 = 120.20/x
  3. Step 3: Cross multiply
    325.65x = 488.54 × 120.20
  4. Step 4: Simplify right side
    325.65x = 58,722.51
  5. Step 5: Solve for x
    x = 58,722.51/325.65
  6. Step 6: Final answer
    x = 180.32

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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.