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Finding the Fourth Proportional to 139,989.70, 209,995.55 and 68,950.54

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Solution

The fourth proportional to 139,989.70, 209,995.55 and 68,950.54 is: 103,431.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,989.70 : 209,995.55 = 68,950.54 : x
  2. Step 2: Convert to fraction form
    139,989.70/209,995.55 = 68,950.54/x
  3. Step 3: Cross multiply
    139,989.70x = 209,995.55 × 68,950.54
  4. Step 4: Simplify right side
    139,989.70x = 14,479,306,570.10
  5. Step 5: Solve for x
    x = 14,479,306,570.10/139,989.70
  6. Step 6: Final answer
    x = 103,431.23

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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.