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Finding the Fourth Proportional to 392.88, 589.72 and 270.72

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Solution

The fourth proportional to 392.88, 589.72 and 270.72 is: 406.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.88 : 589.72 = 270.72 : x
  2. Step 2: Convert to fraction form
    392.88/589.72 = 270.72/x
  3. Step 3: Cross multiply
    392.88x = 589.72 × 270.72
  4. Step 4: Simplify right side
    392.88x = 159,649.00
  5. Step 5: Solve for x
    x = 159,649.00/392.88
  6. Step 6: Final answer
    x = 406.36

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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.