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Finding the Fourth Proportional to 85,618.27, 128,428.27 and 38,235.78

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Solution

The fourth proportional to 85,618.27, 128,428.27 and 38,235.78 is: 57,354.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,618.27 : 128,428.27 = 38,235.78 : x
  2. Step 2: Convert to fraction form
    85,618.27/128,428.27 = 38,235.78/x
  3. Step 3: Cross multiply
    85,618.27x = 128,428.27 × 38,235.78
  4. Step 4: Simplify right side
    85,618.27x = 4,910,554,435.36
  5. Step 5: Solve for x
    x = 4,910,554,435.36/85,618.27
  6. Step 6: Final answer
    x = 57,354.05

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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.