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Finding the Fourth Proportional to 323.55, 485.31 and 80.07

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Solution

The fourth proportional to 323.55, 485.31 and 80.07 is: 120.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    323.55 : 485.31 = 80.07 : x
  2. Step 2: Convert to fraction form
    323.55/485.31 = 80.07/x
  3. Step 3: Cross multiply
    323.55x = 485.31 × 80.07
  4. Step 4: Simplify right side
    323.55x = 38,858.77
  5. Step 5: Solve for x
    x = 38,858.77/323.55
  6. Step 6: Final answer
    x = 120.10

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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.