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Finding the Fourth Proportional to 355.58, 533.45 and 139.18

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Solution

The fourth proportional to 355.58, 533.45 and 139.18 is: 208.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.58 : 533.45 = 139.18 : x
  2. Step 2: Convert to fraction form
    355.58/533.45 = 139.18/x
  3. Step 3: Cross multiply
    355.58x = 533.45 × 139.18
  4. Step 4: Simplify right side
    355.58x = 74,242.21
  5. Step 5: Solve for x
    x = 74,242.21/355.58
  6. Step 6: Final answer
    x = 208.79

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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.