Home / 139,311.12-192,251.58-78,880.15

Finding the Fourth Proportional to 139,311.12, 192,251.58 and 78,880.15

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Solution

The fourth proportional to 139,311.12, 192,251.58 and 78,880.15 is: 108,855.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,311.12 : 192,251.58 = 78,880.15 : x
  2. Step 2: Convert to fraction form
    139,311.12/192,251.58 = 78,880.15/x
  3. Step 3: Cross multiply
    139,311.12x = 192,251.58 × 78,880.15
  4. Step 4: Simplify right side
    139,311.12x = 15,164,832,987.51
  5. Step 5: Solve for x
    x = 15,164,832,987.51/139,311.12
  6. Step 6: Final answer
    x = 108,855.87

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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.