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Finding the Fourth Proportional to 85,804.32, 128,119.56 and 76,861.92

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Solution

The fourth proportional to 85,804.32, 128,119.56 and 76,861.92 is: 114,767.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,804.32 : 128,119.56 = 76,861.92 : x
  2. Step 2: Convert to fraction form
    85,804.32/128,119.56 = 76,861.92/x
  3. Step 3: Cross multiply
    85,804.32x = 128,119.56 × 76,861.92
  4. Step 4: Simplify right side
    85,804.32x = 9,847,515,371.16
  5. Step 5: Solve for x
    x = 9,847,515,371.16/85,804.32
  6. Step 6: Final answer
    x = 114,767.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.