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Finding the Fourth Proportional to 139,458.92, 192,471 and 79,039.40

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Solution

The fourth proportional to 139,458.92, 192,471 and 79,039.40 is: 109,084.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,458.92 : 192,471 = 79,039.40 : x
  2. Step 2: Convert to fraction form
    139,458.92/192,471 = 79,039.40/x
  3. Step 3: Cross multiply
    139,458.92x = 192,471 × 79,039.40
  4. Step 4: Simplify right side
    139,458.92x = 15,212,792,357.40
  5. Step 5: Solve for x
    x = 15,212,792,357.40/139,458.92
  6. Step 6: Final answer
    x = 109,084.40

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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.