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Finding the Fourth Proportional to 139,153.62, 208,739.07 and 39,321.45

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Solution

The fourth proportional to 139,153.62, 208,739.07 and 39,321.45 is: 58,984.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,153.62 : 208,739.07 = 39,321.45 : x
  2. Step 2: Convert to fraction form
    139,153.62/208,739.07 = 39,321.45/x
  3. Step 3: Cross multiply
    139,153.62x = 208,739.07 × 39,321.45
  4. Step 4: Simplify right side
    139,153.62x = 8,207,922,904.05
  5. Step 5: Solve for x
    x = 8,207,922,904.05/139,153.62
  6. Step 6: Final answer
    x = 58,984.62

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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.