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Finding the Fourth Proportional to 66,091.80, 99,128.10 and 19,339.80

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Solution

The fourth proportional to 66,091.80, 99,128.10 and 19,339.80 is: 29,006.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,091.80 : 99,128.10 = 19,339.80 : x
  2. Step 2: Convert to fraction form
    66,091.80/99,128.10 = 19,339.80/x
  3. Step 3: Cross multiply
    66,091.80x = 99,128.10 × 19,339.80
  4. Step 4: Simplify right side
    66,091.80x = 1,917,117,628.38
  5. Step 5: Solve for x
    x = 1,917,117,628.38/66,091.80
  6. Step 6: Final answer
    x = 29,006.89

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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.