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Finding the Fourth Proportional to 128,520.80, 192,795.60 and 39,773.60

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Solution

The fourth proportional to 128,520.80, 192,795.60 and 39,773.60 is: 59,664.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,520.80 : 192,795.60 = 39,773.60 : x
  2. Step 2: Convert to fraction form
    128,520.80/192,795.60 = 39,773.60/x
  3. Step 3: Cross multiply
    128,520.80x = 192,795.60 × 39,773.60
  4. Step 4: Simplify right side
    128,520.80x = 7,668,175,076.16
  5. Step 5: Solve for x
    x = 7,668,175,076.16/128,520.80
  6. Step 6: Final answer
    x = 59,664.86

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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.