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Finding the Fourth Proportional to 939.58, 1,409.39 and 290.31

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Solution

The fourth proportional to 939.58, 1,409.39 and 290.31 is: 435.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.58 : 1,409.39 = 290.31 : x
  2. Step 2: Convert to fraction form
    939.58/1,409.39 = 290.31/x
  3. Step 3: Cross multiply
    939.58x = 1,409.39 × 290.31
  4. Step 4: Simplify right side
    939.58x = 409,160.01
  5. Step 5: Solve for x
    x = 409,160.01/939.58
  6. Step 6: Final answer
    x = 435.47

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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.