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Finding the Fourth Proportional to 65,389.38, 89,954.17 and 57,286.54

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Solution

The fourth proportional to 65,389.38, 89,954.17 and 57,286.54 is: 78,807.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,389.38 : 89,954.17 = 57,286.54 : x
  2. Step 2: Convert to fraction form
    65,389.38/89,954.17 = 57,286.54/x
  3. Step 3: Cross multiply
    65,389.38x = 89,954.17 × 57,286.54
  4. Step 4: Simplify right side
    65,389.38x = 5,153,163,157.87
  5. Step 5: Solve for x
    x = 5,153,163,157.87/65,389.38
  6. Step 6: Final answer
    x = 78,807.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.