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Finding the Fourth Proportional to 139,940.70, 209,911.05 and 132,359.10

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Solution

The fourth proportional to 139,940.70, 209,911.05 and 132,359.10 is: 198,538.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,940.70 : 209,911.05 = 132,359.10 : x
  2. Step 2: Convert to fraction form
    139,940.70/209,911.05 = 132,359.10/x
  3. Step 3: Cross multiply
    139,940.70x = 209,911.05 × 132,359.10
  4. Step 4: Simplify right side
    139,940.70x = 27,783,637,658.06
  5. Step 5: Solve for x
    x = 27,783,637,658.06/139,940.70
  6. Step 6: Final answer
    x = 198,538.65

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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.