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Finding the Fourth Proportional to 139,572.32, 209,191.70 and 50,721.80

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Solution

The fourth proportional to 139,572.32, 209,191.70 and 50,721.80 is: 76,022.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,572.32 : 209,191.70 = 50,721.80 : x
  2. Step 2: Convert to fraction form
    139,572.32/209,191.70 = 50,721.80/x
  3. Step 3: Cross multiply
    139,572.32x = 209,191.70 × 50,721.80
  4. Step 4: Simplify right side
    139,572.32x = 10,610,579,315.45
  5. Step 5: Solve for x
    x = 10,610,579,315.45/139,572.32
  6. Step 6: Final answer
    x = 76,022.09

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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.