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Finding the Fourth Proportional to 128,748.48, 177,450.56 and 85,650.88

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Solution

The fourth proportional to 128,748.48, 177,450.56 and 85,650.88 is: 118,050.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,748.48 : 177,450.56 = 85,650.88 : x
  2. Step 2: Convert to fraction form
    128,748.48/177,450.56 = 85,650.88/x
  3. Step 3: Cross multiply
    128,748.48x = 177,450.56 × 85,650.88
  4. Step 4: Simplify right side
    128,748.48x = 15,198,796,620.49
  5. Step 5: Solve for x
    x = 15,198,796,620.49/128,748.48
  6. Step 6: Final answer
    x = 118,050.30

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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.