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Finding the Fourth Proportional to 939.83, 1,409.74 and 290.56

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Solution

The fourth proportional to 939.83, 1,409.74 and 290.56 is: 435.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.83 : 1,409.74 = 290.56 : x
  2. Step 2: Convert to fraction form
    939.83/1,409.74 = 290.56/x
  3. Step 3: Cross multiply
    939.83x = 1,409.74 × 290.56
  4. Step 4: Simplify right side
    939.83x = 409,614.05
  5. Step 5: Solve for x
    x = 409,614.05/939.83
  6. Step 6: Final answer
    x = 435.84

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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.