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Finding the Fourth Proportional to 139,360.95, 192,321.67 and 78,930.70

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Solution

The fourth proportional to 139,360.95, 192,321.67 and 78,930.70 is: 108,926.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,360.95 : 192,321.67 = 78,930.70 : x
  2. Step 2: Convert to fraction form
    139,360.95/192,321.67 = 78,930.70/x
  3. Step 3: Cross multiply
    139,360.95x = 192,321.67 × 78,930.70
  4. Step 4: Simplify right side
    139,360.95x = 15,180,083,360.14
  5. Step 5: Solve for x
    x = 15,180,083,360.14/139,360.95
  6. Step 6: Final answer
    x = 108,926.38

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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.