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Finding the Fourth Proportional to 139,983.70, 209,975.55 and 80,934.70

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Solution

The fourth proportional to 139,983.70, 209,975.55 and 80,934.70 is: 121,402.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,983.70 : 209,975.55 = 80,934.70 : x
  2. Step 2: Convert to fraction form
    139,983.70/209,975.55 = 80,934.70/x
  3. Step 3: Cross multiply
    139,983.70x = 209,975.55 × 80,934.70
  4. Step 4: Simplify right side
    139,983.70x = 16,994,308,146.59
  5. Step 5: Solve for x
    x = 16,994,308,146.59/139,983.70
  6. Step 6: Final answer
    x = 121,402.05

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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.