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Finding the Fourth Proportional to 139,728.80, 192,819.44 and 76,064.96

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Solution

The fourth proportional to 139,728.80, 192,819.44 and 76,064.96 is: 104,966.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,728.80 : 192,819.44 = 76,064.96 : x
  2. Step 2: Convert to fraction form
    139,728.80/192,819.44 = 76,064.96/x
  3. Step 3: Cross multiply
    139,728.80x = 192,819.44 × 76,064.96
  4. Step 4: Simplify right side
    139,728.80x = 14,666,802,990.82
  5. Step 5: Solve for x
    x = 14,666,802,990.82/139,728.80
  6. Step 6: Final answer
    x = 104,966.21

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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.