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Finding the Fourth Proportional to 392.78, 589.10 and 149.31

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Solution

The fourth proportional to 392.78, 589.10 and 149.31 is: 223.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.78 : 589.10 = 149.31 : x
  2. Step 2: Convert to fraction form
    392.78/589.10 = 149.31/x
  3. Step 3: Cross multiply
    392.78x = 589.10 × 149.31
  4. Step 4: Simplify right side
    392.78x = 87,957.77
  5. Step 5: Solve for x
    x = 87,957.77/392.78
  6. Step 6: Final answer
    x = 223.94

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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.