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Finding the Fourth Proportional to 139,424.75, 192,390.54 and 78,982.45

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Solution

The fourth proportional to 139,424.75, 192,390.54 and 78,982.45 is: 108,986.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,424.75 : 192,390.54 = 78,982.45 : x
  2. Step 2: Convert to fraction form
    139,424.75/192,390.54 = 78,982.45/x
  3. Step 3: Cross multiply
    139,424.75x = 192,390.54 × 78,982.45
  4. Step 4: Simplify right side
    139,424.75x = 15,195,476,206.02
  5. Step 5: Solve for x
    x = 15,195,476,206.02/139,424.75
  6. Step 6: Final answer
    x = 108,986.94

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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.