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Finding the Fourth Proportional to 128,469.28, 177,339.12 and 84,855.52

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Solution

The fourth proportional to 128,469.28, 177,339.12 and 84,855.52 is: 117,134.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,469.28 : 177,339.12 = 84,855.52 : x
  2. Step 2: Convert to fraction form
    128,469.28/177,339.12 = 84,855.52/x
  3. Step 3: Cross multiply
    128,469.28x = 177,339.12 × 84,855.52
  4. Step 4: Simplify right side
    128,469.28x = 15,048,203,243.94
  5. Step 5: Solve for x
    x = 15,048,203,243.94/128,469.28
  6. Step 6: Final answer
    x = 117,134.64

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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.