Home / 128,276.70-192,415.05-86,286.30

Finding the Fourth Proportional to 128,276.70, 192,415.05 and 86,286.30

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Solution

The fourth proportional to 128,276.70, 192,415.05 and 86,286.30 is: 129,429.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,276.70 : 192,415.05 = 86,286.30 : x
  2. Step 2: Convert to fraction form
    128,276.70/192,415.05 = 86,286.30/x
  3. Step 3: Cross multiply
    128,276.70x = 192,415.05 × 86,286.30
  4. Step 4: Simplify right side
    128,276.70x = 16,602,782,728.82
  5. Step 5: Solve for x
    x = 16,602,782,728.82/128,276.70
  6. Step 6: Final answer
    x = 129,429.45

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.