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Finding the Fourth Proportional to 355.50, 533.40 and 139.02

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Solution

The fourth proportional to 355.50, 533.40 and 139.02 is: 208.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.50 : 533.40 = 139.02 : x
  2. Step 2: Convert to fraction form
    355.50/533.40 = 139.02/x
  3. Step 3: Cross multiply
    355.50x = 533.40 × 139.02
  4. Step 4: Simplify right side
    355.50x = 74,153.27
  5. Step 5: Solve for x
    x = 74,153.27/355.50
  6. Step 6: Final answer
    x = 208.59

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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.