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Finding the Fourth Proportional to 139,492.80, 192,499.26 and 79,074.84

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Solution

The fourth proportional to 139,492.80, 192,499.26 and 79,074.84 is: 109,122.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,492.80 : 192,499.26 = 79,074.84 : x
  2. Step 2: Convert to fraction form
    139,492.80/192,499.26 = 79,074.84/x
  3. Step 3: Cross multiply
    139,492.80x = 192,499.26 × 79,074.84
  4. Step 4: Simplify right side
    139,492.80x = 15,221,848,184.62
  5. Step 5: Solve for x
    x = 15,221,848,184.62/139,492.80
  6. Step 6: Final answer
    x = 109,122.82

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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.