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Finding the Fourth Proportional to 939.87, 1,409.70 and 323.55

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Solution

The fourth proportional to 939.87, 1,409.70 and 323.55 is: 485.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.87 : 1,409.70 = 323.55 : x
  2. Step 2: Convert to fraction form
    939.87/1,409.70 = 323.55/x
  3. Step 3: Cross multiply
    939.87x = 1,409.70 × 323.55
  4. Step 4: Simplify right side
    939.87x = 456,108.44
  5. Step 5: Solve for x
    x = 456,108.44/939.87
  6. Step 6: Final answer
    x = 485.29

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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.