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Finding the Fourth Proportional to 139,653.88, 192,720.73 and 75,990.58

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Solution

The fourth proportional to 139,653.88, 192,720.73 and 75,990.58 is: 104,866.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,653.88 : 192,720.73 = 75,990.58 : x
  2. Step 2: Convert to fraction form
    139,653.88/192,720.73 = 75,990.58/x
  3. Step 3: Cross multiply
    139,653.88x = 192,720.73 × 75,990.58
  4. Step 4: Simplify right side
    139,653.88x = 14,644,958,707.17
  5. Step 5: Solve for x
    x = 14,644,958,707.17/139,653.88
  6. Step 6: Final answer
    x = 104,866.11

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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.