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Finding the Fourth Proportional to 392.20, 589.20 and 276.91

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Solution

The fourth proportional to 392.20, 589.20 and 276.91 is: 416.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.20 : 589.20 = 276.91 : x
  2. Step 2: Convert to fraction form
    392.20/589.20 = 276.91/x
  3. Step 3: Cross multiply
    392.20x = 589.20 × 276.91
  4. Step 4: Simplify right side
    392.20x = 163,155.37
  5. Step 5: Solve for x
    x = 163,155.37/392.20
  6. Step 6: Final answer
    x = 416.00

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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.