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Finding the Fourth Proportional to 128,193.90, 176,910.36 and 71,605.40

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Solution

The fourth proportional to 128,193.90, 176,910.36 and 71,605.40 is: 98,817.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,193.90 : 176,910.36 = 71,605.40 : x
  2. Step 2: Convert to fraction form
    128,193.90/176,910.36 = 71,605.40/x
  3. Step 3: Cross multiply
    128,193.90x = 176,910.36 × 71,605.40
  4. Step 4: Simplify right side
    128,193.90x = 12,667,737,091.94
  5. Step 5: Solve for x
    x = 12,667,737,091.94/128,193.90
  6. Step 6: Final answer
    x = 98,817.00

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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.