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Finding the Fourth Proportional to 481.60, 722.34 and 139.60

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Solution

The fourth proportional to 481.60, 722.34 and 139.60 is: 209.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.60 : 722.34 = 139.60 : x
  2. Step 2: Convert to fraction form
    481.60/722.34 = 139.60/x
  3. Step 3: Cross multiply
    481.60x = 722.34 × 139.60
  4. Step 4: Simplify right side
    481.60x = 100,838.66
  5. Step 5: Solve for x
    x = 100,838.66/481.60
  6. Step 6: Final answer
    x = 209.38

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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.