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Finding the Fourth Proportional to 128,591.36, 177,471.24 and 71,991.80

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Solution

The fourth proportional to 128,591.36, 177,471.24 and 71,991.80 is: 99,357.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,591.36 : 177,471.24 = 71,991.80 : x
  2. Step 2: Convert to fraction form
    128,591.36/177,471.24 = 71,991.80/x
  3. Step 3: Cross multiply
    128,591.36x = 177,471.24 × 71,991.80
  4. Step 4: Simplify right side
    128,591.36x = 12,776,474,015.83
  5. Step 5: Solve for x
    x = 12,776,474,015.83/128,591.36
  6. Step 6: Final answer
    x = 99,357.17

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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.