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Finding the Fourth Proportional to 139,981.80, 209,972.70 and 51,205.80

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Solution

The fourth proportional to 139,981.80, 209,972.70 and 51,205.80 is: 76,808.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,981.80 : 209,972.70 = 51,205.80 : x
  2. Step 2: Convert to fraction form
    139,981.80/209,972.70 = 51,205.80/x
  3. Step 3: Cross multiply
    139,981.80x = 209,972.70 × 51,205.80
  4. Step 4: Simplify right side
    139,981.80x = 10,751,820,081.66
  5. Step 5: Solve for x
    x = 10,751,820,081.66/139,981.80
  6. Step 6: Final answer
    x = 76,808.70

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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.