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Finding the Fourth Proportional to 128,940.96, 177,890.40 and 98,695.20

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Solution

The fourth proportional to 128,940.96, 177,890.40 and 98,695.20 is: 136,162.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,940.96 : 177,890.40 = 98,695.20 : x
  2. Step 2: Convert to fraction form
    128,940.96/177,890.40 = 98,695.20/x
  3. Step 3: Cross multiply
    128,940.96x = 177,890.40 × 98,695.20
  4. Step 4: Simplify right side
    128,940.96x = 17,556,928,606.08
  5. Step 5: Solve for x
    x = 17,556,928,606.08/128,940.96
  6. Step 6: Final answer
    x = 136,162.54

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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.