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Finding the Fourth Proportional to 391.34, 585.84 and 236.80

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Solution

The fourth proportional to 391.34, 585.84 and 236.80 is: 354.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.34 : 585.84 = 236.80 : x
  2. Step 2: Convert to fraction form
    391.34/585.84 = 236.80/x
  3. Step 3: Cross multiply
    391.34x = 585.84 × 236.80
  4. Step 4: Simplify right side
    391.34x = 138,722.80
  5. Step 5: Solve for x
    x = 138,722.80/391.34
  6. Step 6: Final answer
    x = 354.48

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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.