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Finding the Fourth Proportional to 128,817.42, 193,132.71 and 86,592.77

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Solution

The fourth proportional to 128,817.42, 193,132.71 and 86,592.77 is: 129,826.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,817.42 : 193,132.71 = 86,592.77 : x
  2. Step 2: Convert to fraction form
    128,817.42/193,132.71 = 86,592.77/x
  3. Step 3: Cross multiply
    128,817.42x = 193,132.71 × 86,592.77
  4. Step 4: Simplify right side
    128,817.42x = 16,723,895,903.54
  5. Step 5: Solve for x
    x = 16,723,895,903.54/128,817.42
  6. Step 6: Final answer
    x = 129,826.36

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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.