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Finding the Fourth Proportional to 139,425.75, 209,143.53 and 44,658.81

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Solution

The fourth proportional to 139,425.75, 209,143.53 and 44,658.81 is: 66,989.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,425.75 : 209,143.53 = 44,658.81 : x
  2. Step 2: Convert to fraction form
    139,425.75/209,143.53 = 44,658.81/x
  3. Step 3: Cross multiply
    139,425.75x = 209,143.53 × 44,658.81
  4. Step 4: Simplify right side
    139,425.75x = 9,340,101,169.00
  5. Step 5: Solve for x
    x = 9,340,101,169.00/139,425.75
  6. Step 6: Final answer
    x = 66,989.79

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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.