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Finding the Fourth Proportional to 139,356.02, 192,316.20 and 78,928.40

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Solution

The fourth proportional to 139,356.02, 192,316.20 and 78,928.40 is: 108,923.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,356.02 : 192,316.20 = 78,928.40 : x
  2. Step 2: Convert to fraction form
    139,356.02/192,316.20 = 78,928.40/x
  3. Step 3: Cross multiply
    139,356.02x = 192,316.20 × 78,928.40
  4. Step 4: Simplify right side
    139,356.02x = 15,179,209,960.08
  5. Step 5: Solve for x
    x = 15,179,209,960.08/139,356.02
  6. Step 6: Final answer
    x = 108,923.96

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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.