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Finding the Fourth Proportional to 946.39, 1,418.97 and 398.42

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Solution

The fourth proportional to 946.39, 1,418.97 and 398.42 is: 597.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.39 : 1,418.97 = 398.42 : x
  2. Step 2: Convert to fraction form
    946.39/1,418.97 = 398.42/x
  3. Step 3: Cross multiply
    946.39x = 1,418.97 × 398.42
  4. Step 4: Simplify right side
    946.39x = 565,351.07
  5. Step 5: Solve for x
    x = 565,351.07/946.39
  6. Step 6: Final answer
    x = 597.38

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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.