Home / 128,639.12-192,986.40-39,890.84

Finding the Fourth Proportional to 128,639.12, 192,986.40 and 39,890.84

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Solution

The fourth proportional to 128,639.12, 192,986.40 and 39,890.84 is: 59,844.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,639.12 : 192,986.40 = 39,890.84 : x
  2. Step 2: Convert to fraction form
    128,639.12/192,986.40 = 39,890.84/x
  3. Step 3: Cross multiply
    128,639.12x = 192,986.40 × 39,890.84
  4. Step 4: Simplify right side
    128,639.12x = 7,698,389,604.58
  5. Step 5: Solve for x
    x = 7,698,389,604.58/128,639.12
  6. Step 6: Final answer
    x = 59,844.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.