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Finding the Fourth Proportional to 391.28, 585.90 and 310.28

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Solution

The fourth proportional to 391.28, 585.90 and 310.28 is: 464.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.28 : 585.90 = 310.28 : x
  2. Step 2: Convert to fraction form
    391.28/585.90 = 310.28/x
  3. Step 3: Cross multiply
    391.28x = 585.90 × 310.28
  4. Step 4: Simplify right side
    391.28x = 181,790.12
  5. Step 5: Solve for x
    x = 181,790.12/391.28
  6. Step 6: Final answer
    x = 464.61

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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.