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Finding the Fourth Proportional to 355.75, 533.64 and 139.30

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Solution

The fourth proportional to 355.75, 533.64 and 139.30 is: 208.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.75 : 533.64 = 139.30 : x
  2. Step 2: Convert to fraction form
    355.75/533.64 = 139.30/x
  3. Step 3: Cross multiply
    355.75x = 533.64 × 139.30
  4. Step 4: Simplify right side
    355.75x = 74,336.05
  5. Step 5: Solve for x
    x = 74,336.05/355.75
  6. Step 6: Final answer
    x = 208.96

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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.