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Finding the Fourth Proportional to 128,790.98, 177,819.54 and 80,466.48

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Solution

The fourth proportional to 128,790.98, 177,819.54 and 80,466.48 is: 111,098.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,790.98 : 177,819.54 = 80,466.48 : x
  2. Step 2: Convert to fraction form
    128,790.98/177,819.54 = 80,466.48/x
  3. Step 3: Cross multiply
    128,790.98x = 177,819.54 × 80,466.48
  4. Step 4: Simplify right side
    128,790.98x = 14,308,512,459.02
  5. Step 5: Solve for x
    x = 14,308,512,459.02/128,790.98
  6. Step 6: Final answer
    x = 111,098.72

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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.