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Finding the Fourth Proportional to 391.36, 536.84 and 356.80

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Solution

The fourth proportional to 391.36, 536.84 and 356.80 is: 489.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.36 : 536.84 = 356.80 : x
  2. Step 2: Convert to fraction form
    391.36/536.84 = 356.80/x
  3. Step 3: Cross multiply
    391.36x = 536.84 × 356.80
  4. Step 4: Simplify right side
    391.36x = 191,544.51
  5. Step 5: Solve for x
    x = 191,544.51/391.36
  6. Step 6: Final answer
    x = 489.43

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.