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Finding the Fourth Proportional to 392.91, 589.08 and 210.39

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Solution

The fourth proportional to 392.91, 589.08 and 210.39 is: 315.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.91 : 589.08 = 210.39 : x
  2. Step 2: Convert to fraction form
    392.91/589.08 = 210.39/x
  3. Step 3: Cross multiply
    392.91x = 589.08 × 210.39
  4. Step 4: Simplify right side
    392.91x = 123,936.54
  5. Step 5: Solve for x
    x = 123,936.54/392.91
  6. Step 6: Final answer
    x = 315.43

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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.