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Finding the Fourth Proportional to 939.75, 1,409.70 and 323.45

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Solution

The fourth proportional to 939.75, 1,409.70 and 323.45 is: 485.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.75 : 1,409.70 = 323.45 : x
  2. Step 2: Convert to fraction form
    939.75/1,409.70 = 323.45/x
  3. Step 3: Cross multiply
    939.75x = 1,409.70 × 323.45
  4. Step 4: Simplify right side
    939.75x = 455,970.99
  5. Step 5: Solve for x
    x = 455,970.99/939.75
  6. Step 6: Final answer
    x = 485.20

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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.