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Finding the Fourth Proportional to 78,003.60, 117,005.40 and 66,193.80

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Solution

The fourth proportional to 78,003.60, 117,005.40 and 66,193.80 is: 99,290.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,003.60 : 117,005.40 = 66,193.80 : x
  2. Step 2: Convert to fraction form
    78,003.60/117,005.40 = 66,193.80/x
  3. Step 3: Cross multiply
    78,003.60x = 117,005.40 × 66,193.80
  4. Step 4: Simplify right side
    78,003.60x = 7,745,032,046.52
  5. Step 5: Solve for x
    x = 7,745,032,046.52/78,003.60
  6. Step 6: Final answer
    x = 99,290.70

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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.