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Finding the Fourth Proportional to 128,424.32, 192,375.36 and 104,816

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Solution

The fourth proportional to 128,424.32, 192,375.36 and 104,816 is: 157,010.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,424.32 : 192,375.36 = 104,816 : x
  2. Step 2: Convert to fraction form
    128,424.32/192,375.36 = 104,816/x
  3. Step 3: Cross multiply
    128,424.32x = 192,375.36 × 104,816
  4. Step 4: Simplify right side
    128,424.32x = 20,164,015,733.76
  5. Step 5: Solve for x
    x = 20,164,015,733.76/128,424.32
  6. Step 6: Final answer
    x = 157,010.88

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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.