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Finding the Fourth Proportional to 139,729, 192,840.60 and 79,315.96

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Solution

The fourth proportional to 139,729, 192,840.60 and 79,315.96 is: 109,464.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,729 : 192,840.60 = 79,315.96 : x
  2. Step 2: Convert to fraction form
    139,729/192,840.60 = 79,315.96/x
  3. Step 3: Cross multiply
    139,729x = 192,840.60 × 79,315.96
  4. Step 4: Simplify right side
    139,729x = 15,295,337,315.98
  5. Step 5: Solve for x
    x = 15,295,337,315.98/139,729
  6. Step 6: Final answer
    x = 109,464.30

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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.