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Finding the Fourth Proportional to 128,910.81, 177,918.32 and 75,195.86

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Solution

The fourth proportional to 128,910.81, 177,918.32 and 75,195.86 is: 103,782.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,910.81 : 177,918.32 = 75,195.86 : x
  2. Step 2: Convert to fraction form
    128,910.81/177,918.32 = 75,195.86/x
  3. Step 3: Cross multiply
    128,910.81x = 177,918.32 × 75,195.86
  4. Step 4: Simplify right side
    128,910.81x = 13,378,721,082.16
  5. Step 5: Solve for x
    x = 13,378,721,082.16/128,910.81
  6. Step 6: Final answer
    x = 103,782.77

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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.