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Finding the Fourth Proportional to 139.60, 192.54 and 104.64

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Solution

The fourth proportional to 139.60, 192.54 and 104.64 is: 144.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.60 : 192.54 = 104.64 : x
  2. Step 2: Convert to fraction form
    139.60/192.54 = 104.64/x
  3. Step 3: Cross multiply
    139.60x = 192.54 × 104.64
  4. Step 4: Simplify right side
    139.60x = 20,147.39
  5. Step 5: Solve for x
    x = 20,147.39/139.60
  6. Step 6: Final answer
    x = 144.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.