Home / 128,639.35-192,977.70-39,900

Finding the Fourth Proportional to 128,639.35, 192,977.70 and 39,900

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Solution

The fourth proportional to 128,639.35, 192,977.70 and 39,900 is: 59,855.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,639.35 : 192,977.70 = 39,900 : x
  2. Step 2: Convert to fraction form
    128,639.35/192,977.70 = 39,900/x
  3. Step 3: Cross multiply
    128,639.35x = 192,977.70 × 39,900
  4. Step 4: Simplify right side
    128,639.35x = 7,699,810,230
  5. Step 5: Solve for x
    x = 7,699,810,230/128,639.35
  6. Step 6: Final answer
    x = 59,855.79

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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.