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Finding the Fourth Proportional to 139,989.53, 193,180.74 and 79,559.12

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Solution

The fourth proportional to 139,989.53, 193,180.74 and 79,559.12 is: 109,788.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,989.53 : 193,180.74 = 79,559.12 : x
  2. Step 2: Convert to fraction form
    139,989.53/193,180.74 = 79,559.12/x
  3. Step 3: Cross multiply
    139,989.53x = 193,180.74 × 79,559.12
  4. Step 4: Simplify right side
    139,989.53x = 15,369,289,675.35
  5. Step 5: Solve for x
    x = 15,369,289,675.35/139,989.53
  6. Step 6: Final answer
    x = 109,788.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.