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Finding the Fourth Proportional to 392.86, 589.47 and 149.38

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Solution

The fourth proportional to 392.86, 589.47 and 149.38 is: 224.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.86 : 589.47 = 149.38 : x
  2. Step 2: Convert to fraction form
    392.86/589.47 = 149.38/x
  3. Step 3: Cross multiply
    392.86x = 589.47 × 149.38
  4. Step 4: Simplify right side
    392.86x = 88,055.03
  5. Step 5: Solve for x
    x = 88,055.03/392.86
  6. Step 6: Final answer
    x = 224.14

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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.