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Finding the Fourth Proportional to 939.68, 1,409.44 and 290.44

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Solution

The fourth proportional to 939.68, 1,409.44 and 290.44 is: 435.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.68 : 1,409.44 = 290.44 : x
  2. Step 2: Convert to fraction form
    939.68/1,409.44 = 290.44/x
  3. Step 3: Cross multiply
    939.68x = 1,409.44 × 290.44
  4. Step 4: Simplify right side
    939.68x = 409,357.75
  5. Step 5: Solve for x
    x = 409,357.75/939.68
  6. Step 6: Final answer
    x = 435.64

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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.