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Finding the Fourth Proportional to 89,615.70, 134,423.55 and 85,679.10

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Solution

The fourth proportional to 89,615.70, 134,423.55 and 85,679.10 is: 128,518.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,615.70 : 134,423.55 = 85,679.10 : x
  2. Step 2: Convert to fraction form
    89,615.70/134,423.55 = 85,679.10/x
  3. Step 3: Cross multiply
    89,615.70x = 134,423.55 × 85,679.10
  4. Step 4: Simplify right side
    89,615.70x = 11,517,288,782.81
  5. Step 5: Solve for x
    x = 11,517,288,782.81/89,615.70
  6. Step 6: Final answer
    x = 128,518.65

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Similar ratio
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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.