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Finding the Fourth Proportional to 128,767.80, 177,621.06 and 85,160.28

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Solution

The fourth proportional to 128,767.80, 177,621.06 and 85,160.28 is: 117,469.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,767.80 : 177,621.06 = 85,160.28 : x
  2. Step 2: Convert to fraction form
    128,767.80/177,621.06 = 85,160.28/x
  3. Step 3: Cross multiply
    128,767.80x = 177,621.06 × 85,160.28
  4. Step 4: Simplify right side
    128,767.80x = 15,126,259,203.50
  5. Step 5: Solve for x
    x = 15,126,259,203.50/128,767.80
  6. Step 6: Final answer
    x = 117,469.27

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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.