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Finding the Fourth Proportional to 355.22, 533.06 and 138.80

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Solution

The fourth proportional to 355.22, 533.06 and 138.80 is: 208.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.22 : 533.06 = 138.80 : x
  2. Step 2: Convert to fraction form
    355.22/533.06 = 138.80/x
  3. Step 3: Cross multiply
    355.22x = 533.06 × 138.80
  4. Step 4: Simplify right side
    355.22x = 73,987.67
  5. Step 5: Solve for x
    x = 73,987.67/355.22
  6. Step 6: Final answer
    x = 208.29

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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.