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Finding the Fourth Proportional to 139,356.48, 209,060.64 and 45,868.80

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Solution

The fourth proportional to 139,356.48, 209,060.64 and 45,868.80 is: 68,811.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,356.48 : 209,060.64 = 45,868.80 : x
  2. Step 2: Convert to fraction form
    139,356.48/209,060.64 = 45,868.80/x
  3. Step 3: Cross multiply
    139,356.48x = 209,060.64 × 45,868.80
  4. Step 4: Simplify right side
    139,356.48x = 9,589,360,684.03
  5. Step 5: Solve for x
    x = 9,589,360,684.03/139,356.48
  6. Step 6: Final answer
    x = 68,811.73

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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.