Home / 139,140.48-192,013.92-78,709.80

Finding the Fourth Proportional to 139,140.48, 192,013.92 and 78,709.80

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Solution

The fourth proportional to 139,140.48, 192,013.92 and 78,709.80 is: 108,619.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,140.48 : 192,013.92 = 78,709.80 : x
  2. Step 2: Convert to fraction form
    139,140.48/192,013.92 = 78,709.80/x
  3. Step 3: Cross multiply
    139,140.48x = 192,013.92 × 78,709.80
  4. Step 4: Simplify right side
    139,140.48x = 15,113,377,240.42
  5. Step 5: Solve for x
    x = 15,113,377,240.42/139,140.48
  6. Step 6: Final answer
    x = 108,619.56

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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.