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Finding the Fourth Proportional to 355.96, 534.06 and 139.42

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Solution

The fourth proportional to 355.96, 534.06 and 139.42 is: 209.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.96 : 534.06 = 139.42 : x
  2. Step 2: Convert to fraction form
    355.96/534.06 = 139.42/x
  3. Step 3: Cross multiply
    355.96x = 534.06 × 139.42
  4. Step 4: Simplify right side
    355.96x = 74,458.65
  5. Step 5: Solve for x
    x = 74,458.65/355.96
  6. Step 6: Final answer
    x = 209.18

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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.