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Finding the Fourth Proportional to 128,332.40, 177,099.12 and 71,743.76

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Solution

The fourth proportional to 128,332.40, 177,099.12 and 71,743.76 is: 99,006.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,332.40 : 177,099.12 = 71,743.76 : x
  2. Step 2: Convert to fraction form
    128,332.40/177,099.12 = 71,743.76/x
  3. Step 3: Cross multiply
    128,332.40x = 177,099.12 × 71,743.76
  4. Step 4: Simplify right side
    128,332.40x = 12,705,756,761.49
  5. Step 5: Solve for x
    x = 12,705,756,761.49/128,332.40
  6. Step 6: Final answer
    x = 99,006.62

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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.