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Finding the Fourth Proportional to 128.48, 192.74 and 41.79

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Solution

The fourth proportional to 128.48, 192.74 and 41.79 is: 62.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.48 : 192.74 = 41.79 : x
  2. Step 2: Convert to fraction form
    128.48/192.74 = 41.79/x
  3. Step 3: Cross multiply
    128.48x = 192.74 × 41.79
  4. Step 4: Simplify right side
    128.48x = 8,054.60
  5. Step 5: Solve for x
    x = 8,054.60/128.48
  6. Step 6: Final answer
    x = 62.69

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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.