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Finding the Fourth Proportional to 128,859.92, 177,860.52 and 72,289.52

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Solution

The fourth proportional to 128,859.92, 177,860.52 and 72,289.52 is: 99,778.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,859.92 : 177,860.52 = 72,289.52 : x
  2. Step 2: Convert to fraction form
    128,859.92/177,860.52 = 72,289.52/x
  3. Step 3: Cross multiply
    128,859.92x = 177,860.52 × 72,289.52
  4. Step 4: Simplify right side
    128,859.92x = 12,857,450,728.45
  5. Step 5: Solve for x
    x = 12,857,450,728.45/128,859.92
  6. Step 6: Final answer
    x = 99,778.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.