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Finding the Fourth Proportional to 128,593.92, 177,449.76 and 71,997.60

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Solution

The fourth proportional to 128,593.92, 177,449.76 and 71,997.60 is: 99,351.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,593.92 : 177,449.76 = 71,997.60 : x
  2. Step 2: Convert to fraction form
    128,593.92/177,449.76 = 71,997.60/x
  3. Step 3: Cross multiply
    128,593.92x = 177,449.76 × 71,997.60
  4. Step 4: Simplify right side
    128,593.92x = 12,775,956,840.58
  5. Step 5: Solve for x
    x = 12,775,956,840.58/128,593.92
  6. Step 6: Final answer
    x = 99,351.17

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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.