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Finding the Fourth Proportional to 139,279.53, 192,217.65 and 78,860.82

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Solution

The fourth proportional to 139,279.53, 192,217.65 and 78,860.82 is: 108,834.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,279.53 : 192,217.65 = 78,860.82 : x
  2. Step 2: Convert to fraction form
    139,279.53/192,217.65 = 78,860.82/x
  3. Step 3: Cross multiply
    139,279.53x = 192,217.65 × 78,860.82
  4. Step 4: Simplify right side
    139,279.53x = 15,158,441,497.47
  5. Step 5: Solve for x
    x = 15,158,441,497.47/139,279.53
  6. Step 6: Final answer
    x = 108,834.67

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1.5x scale

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.