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Finding the Fourth Proportional to 128,762.88, 193,161.96 and 39,999.84

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Solution

The fourth proportional to 128,762.88, 193,161.96 and 39,999.84 is: 60,005.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,762.88 : 193,161.96 = 39,999.84 : x
  2. Step 2: Convert to fraction form
    128,762.88/193,161.96 = 39,999.84/x
  3. Step 3: Cross multiply
    128,762.88x = 193,161.96 × 39,999.84
  4. Step 4: Simplify right side
    128,762.88x = 7,726,447,494.09
  5. Step 5: Solve for x
    x = 7,726,447,494.09/128,762.88
  6. Step 6: Final answer
    x = 60,005.24

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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.