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Finding the Fourth Proportional to 128,138.92, 176,819.94 and 82,818.28

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Solution

The fourth proportional to 128,138.92, 176,819.94 and 82,818.28 is: 114,281.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,138.92 : 176,819.94 = 82,818.28 : x
  2. Step 2: Convert to fraction form
    128,138.92/176,819.94 = 82,818.28/x
  3. Step 3: Cross multiply
    128,138.92x = 176,819.94 × 82,818.28
  4. Step 4: Simplify right side
    128,138.92x = 14,643,923,300.50
  5. Step 5: Solve for x
    x = 14,643,923,300.50/128,138.92
  6. Step 6: Final answer
    x = 114,281.62

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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.