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Finding the Fourth Proportional to 391.40, 585.58 and 336.12

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Solution

The fourth proportional to 391.40, 585.58 and 336.12 is: 502.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.40 : 585.58 = 336.12 : x
  2. Step 2: Convert to fraction form
    391.40/585.58 = 336.12/x
  3. Step 3: Cross multiply
    391.40x = 585.58 × 336.12
  4. Step 4: Simplify right side
    391.40x = 196,825.15
  5. Step 5: Solve for x
    x = 196,825.15/391.40
  6. Step 6: Final answer
    x = 502.87

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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.