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Finding the Fourth Proportional to 392.90, 589.36 and 149.28

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Solution

The fourth proportional to 392.90, 589.36 and 149.28 is: 223.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.90 : 589.36 = 149.28 : x
  2. Step 2: Convert to fraction form
    392.90/589.36 = 149.28/x
  3. Step 3: Cross multiply
    392.90x = 589.36 × 149.28
  4. Step 4: Simplify right side
    392.90x = 87,979.66
  5. Step 5: Solve for x
    x = 87,979.66/392.90
  6. Step 6: Final answer
    x = 223.92

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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.