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Finding the Fourth Proportional to 939.42, 1,409.19 and 290.07

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Solution

The fourth proportional to 939.42, 1,409.19 and 290.07 is: 435.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.42 : 1,409.19 = 290.07 : x
  2. Step 2: Convert to fraction form
    939.42/1,409.19 = 290.07/x
  3. Step 3: Cross multiply
    939.42x = 1,409.19 × 290.07
  4. Step 4: Simplify right side
    939.42x = 408,763.74
  5. Step 5: Solve for x
    x = 408,763.74/939.42
  6. Step 6: Final answer
    x = 435.12

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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.