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Finding the Fourth Proportional to 355.78, 533.67 and 139.42

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Solution

The fourth proportional to 355.78, 533.67 and 139.42 is: 209.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.78 : 533.67 = 139.42 : x
  2. Step 2: Convert to fraction form
    355.78/533.67 = 139.42/x
  3. Step 3: Cross multiply
    355.78x = 533.67 × 139.42
  4. Step 4: Simplify right side
    355.78x = 74,404.27
  5. Step 5: Solve for x
    x = 74,404.27/355.78
  6. Step 6: Final answer
    x = 209.13

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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.