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Finding the Fourth Proportional to 395.07, 589.15 and 391.42

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Solution

The fourth proportional to 395.07, 589.15 and 391.42 is: 583.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.07 : 589.15 = 391.42 : x
  2. Step 2: Convert to fraction form
    395.07/589.15 = 391.42/x
  3. Step 3: Cross multiply
    395.07x = 589.15 × 391.42
  4. Step 4: Simplify right side
    395.07x = 230,605.09
  5. Step 5: Solve for x
    x = 230,605.09/395.07
  6. Step 6: Final answer
    x = 583.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.