Home / 128,128.90-192,211.72-39,389.84

Finding the Fourth Proportional to 128,128.90, 192,211.72 and 39,389.84

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Solution

The fourth proportional to 128,128.90, 192,211.72 and 39,389.84 is: 59,090.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,128.90 : 192,211.72 = 39,389.84 : x
  2. Step 2: Convert to fraction form
    128,128.90/192,211.72 = 39,389.84/x
  3. Step 3: Cross multiply
    128,128.90x = 192,211.72 × 39,389.84
  4. Step 4: Simplify right side
    128,128.90x = 7,571,188,896.92
  5. Step 5: Solve for x
    x = 7,571,188,896.92/128,128.90
  6. Step 6: Final answer
    x = 59,090.41

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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.