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Finding the Fourth Proportional to 259,975.80, 389,963.70 and 120,007.80

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Solution

The fourth proportional to 259,975.80, 389,963.70 and 120,007.80 is: 180,011.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,975.80 : 389,963.70 = 120,007.80 : x
  2. Step 2: Convert to fraction form
    259,975.80/389,963.70 = 120,007.80/x
  3. Step 3: Cross multiply
    259,975.80x = 389,963.70 × 120,007.80
  4. Step 4: Simplify right side
    259,975.80x = 46,798,685,716.86
  5. Step 5: Solve for x
    x = 46,798,685,716.86/259,975.80
  6. Step 6: Final answer
    x = 180,011.70

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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.