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Finding the Fourth Proportional to 368.21, 550.15 and 355.45

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Solution

The fourth proportional to 368.21, 550.15 and 355.45 is: 531.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.21 : 550.15 = 355.45 : x
  2. Step 2: Convert to fraction form
    368.21/550.15 = 355.45/x
  3. Step 3: Cross multiply
    368.21x = 550.15 × 355.45
  4. Step 4: Simplify right side
    368.21x = 195,550.82
  5. Step 5: Solve for x
    x = 195,550.82/368.21
  6. Step 6: Final answer
    x = 531.09

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.