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Finding the Fourth Proportional to 139,381.70, 209,064.08 and 49,428.87

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Solution

The fourth proportional to 139,381.70, 209,064.08 and 49,428.87 is: 74,140.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,381.70 : 209,064.08 = 49,428.87 : x
  2. Step 2: Convert to fraction form
    139,381.70/209,064.08 = 49,428.87/x
  3. Step 3: Cross multiply
    139,381.70x = 209,064.08 × 49,428.87
  4. Step 4: Simplify right side
    139,381.70x = 10,333,800,571.57
  5. Step 5: Solve for x
    x = 10,333,800,571.57/139,381.70
  6. Step 6: Final answer
    x = 74,140.30

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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.