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Finding the Fourth Proportional to 128,425.60, 192,639.69 and 57,351.85

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Solution

The fourth proportional to 128,425.60, 192,639.69 and 57,351.85 is: 86,028.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,425.60 : 192,639.69 = 57,351.85 : x
  2. Step 2: Convert to fraction form
    128,425.60/192,639.69 = 57,351.85/x
  3. Step 3: Cross multiply
    128,425.60x = 192,639.69 × 57,351.85
  4. Step 4: Simplify right side
    128,425.60x = 11,048,242,604.93
  5. Step 5: Solve for x
    x = 11,048,242,604.93/128,425.60
  6. Step 6: Final answer
    x = 86,028.35

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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.