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Finding the Fourth Proportional to 128,751.96, 177,688.62 and 72,174.28

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Solution

The fourth proportional to 128,751.96, 177,688.62 and 72,174.28 is: 99,606.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,751.96 : 177,688.62 = 72,174.28 : x
  2. Step 2: Convert to fraction form
    128,751.96/177,688.62 = 72,174.28/x
  3. Step 3: Cross multiply
    128,751.96x = 177,688.62 × 72,174.28
  4. Step 4: Simplify right side
    128,751.96x = 12,824,548,212.69
  5. Step 5: Solve for x
    x = 12,824,548,212.69/128,751.96
  6. Step 6: Final answer
    x = 99,606.63

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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.