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Finding the Fourth Proportional to 139,781.28, 209,704.32 and 39,942.84

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Solution

The fourth proportional to 139,781.28, 209,704.32 and 39,942.84 is: 59,923.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,781.28 : 209,704.32 = 39,942.84 : x
  2. Step 2: Convert to fraction form
    139,781.28/209,704.32 = 39,942.84/x
  3. Step 3: Cross multiply
    139,781.28x = 209,704.32 × 39,942.84
  4. Step 4: Simplify right side
    139,781.28x = 8,376,186,101.07
  5. Step 5: Solve for x
    x = 8,376,186,101.07/139,781.28
  6. Step 6: Final answer
    x = 59,923.52

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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.