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Finding the Fourth Proportional to 128,791.98, 177,820.92 and 80,467.50

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Solution

The fourth proportional to 128,791.98, 177,820.92 and 80,467.50 is: 111,100.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,791.98 : 177,820.92 = 80,467.50 : x
  2. Step 2: Convert to fraction form
    128,791.98/177,820.92 = 80,467.50/x
  3. Step 3: Cross multiply
    128,791.98x = 177,820.92 × 80,467.50
  4. Step 4: Simplify right side
    128,791.98x = 14,308,804,880.10
  5. Step 5: Solve for x
    x = 14,308,804,880.10/128,791.98
  6. Step 6: Final answer
    x = 111,100.12

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1.5x scale

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.