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Finding the Fourth Proportional to 939.66, 1,409.58 and 323.48

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Solution

The fourth proportional to 939.66, 1,409.58 and 323.48 is: 485.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.66 : 1,409.58 = 323.48 : x
  2. Step 2: Convert to fraction form
    939.66/1,409.58 = 323.48/x
  3. Step 3: Cross multiply
    939.66x = 1,409.58 × 323.48
  4. Step 4: Simplify right side
    939.66x = 455,963.89
  5. Step 5: Solve for x
    x = 455,963.89/939.66
  6. Step 6: Final answer
    x = 485.24

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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.