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Finding the Fourth Proportional to 128,309.94, 192,452.54 and 39,539.61

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Solution

The fourth proportional to 128,309.94, 192,452.54 and 39,539.61 is: 59,305.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,309.94 : 192,452.54 = 39,539.61 : x
  2. Step 2: Convert to fraction form
    128,309.94/192,452.54 = 39,539.61/x
  3. Step 3: Cross multiply
    128,309.94x = 192,452.54 × 39,539.61
  4. Step 4: Simplify right side
    128,309.94x = 7,609,498,177.41
  5. Step 5: Solve for x
    x = 7,609,498,177.41/128,309.94
  6. Step 6: Final answer
    x = 59,305.60

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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.