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Finding the Fourth Proportional to 85,683.60, 128,525.40 and 66,000.60

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Solution

The fourth proportional to 85,683.60, 128,525.40 and 66,000.60 is: 99,000.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,683.60 : 128,525.40 = 66,000.60 : x
  2. Step 2: Convert to fraction form
    85,683.60/128,525.40 = 66,000.60/x
  3. Step 3: Cross multiply
    85,683.60x = 128,525.40 × 66,000.60
  4. Step 4: Simplify right side
    85,683.60x = 8,482,753,515.24
  5. Step 5: Solve for x
    x = 8,482,753,515.24/85,683.60
  6. Step 6: Final answer
    x = 99,000.90

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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.