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Finding the Fourth Proportional to 128,766.86, 192,901.20 and 72,435.80

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Solution

The fourth proportional to 128,766.86, 192,901.20 and 72,435.80 is: 108,513.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,766.86 : 192,901.20 = 72,435.80 : x
  2. Step 2: Convert to fraction form
    128,766.86/192,901.20 = 72,435.80/x
  3. Step 3: Cross multiply
    128,766.86x = 192,901.20 × 72,435.80
  4. Step 4: Simplify right side
    128,766.86x = 13,972,952,742.96
  5. Step 5: Solve for x
    x = 13,972,952,742.96/128,766.86
  6. Step 6: Final answer
    x = 108,513.58

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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.