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Finding the Fourth Proportional to 85,779.40, 128,674.14 and 33,189.16

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Solution

The fourth proportional to 85,779.40, 128,674.14 and 33,189.16 is: 49,785.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,779.40 : 128,674.14 = 33,189.16 : x
  2. Step 2: Convert to fraction form
    85,779.40/128,674.14 = 33,189.16/x
  3. Step 3: Cross multiply
    85,779.40x = 128,674.14 × 33,189.16
  4. Step 4: Simplify right side
    85,779.40x = 4,270,586,620.32
  5. Step 5: Solve for x
    x = 4,270,586,620.32/85,779.40
  6. Step 6: Final answer
    x = 49,785.69

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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.