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Finding the Fourth Proportional to 387.28, 580.30 and 300.82

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Solution

The fourth proportional to 387.28, 580.30 and 300.82 is: 450.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.28 : 580.30 = 300.82 : x
  2. Step 2: Convert to fraction form
    387.28/580.30 = 300.82/x
  3. Step 3: Cross multiply
    387.28x = 580.30 × 300.82
  4. Step 4: Simplify right side
    387.28x = 174,565.85
  5. Step 5: Solve for x
    x = 174,565.85/387.28
  6. Step 6: Final answer
    x = 450.75

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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.