Home / 128,921.01-177,912.36-71,561.40

Finding the Fourth Proportional to 128,921.01, 177,912.36 and 71,561.40

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Solution

The fourth proportional to 128,921.01, 177,912.36 and 71,561.40 is: 98,755.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,921.01 : 177,912.36 = 71,561.40 : x
  2. Step 2: Convert to fraction form
    128,921.01/177,912.36 = 71,561.40/x
  3. Step 3: Cross multiply
    128,921.01x = 177,912.36 × 71,561.40
  4. Step 4: Simplify right side
    128,921.01x = 12,731,657,558.90
  5. Step 5: Solve for x
    x = 12,731,657,558.90/128,921.01
  6. Step 6: Final answer
    x = 98,755.49

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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.