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Finding the Fourth Proportional to 136,608, 188,521.92 and 76,992

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Solution

The fourth proportional to 136,608, 188,521.92 and 76,992 is: 106,250.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,608 : 188,521.92 = 76,992 : x
  2. Step 2: Convert to fraction form
    136,608/188,521.92 = 76,992/x
  3. Step 3: Cross multiply
    136,608x = 188,521.92 × 76,992
  4. Step 4: Simplify right side
    136,608x = 14,514,679,664.64
  5. Step 5: Solve for x
    x = 14,514,679,664.64/136,608
  6. Step 6: Final answer
    x = 106,250.58

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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.