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Finding the Fourth Proportional to 85,613.76, 128,474.10 and 61,600.50

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Solution

The fourth proportional to 85,613.76, 128,474.10 and 61,600.50 is: 92,439.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,613.76 : 128,474.10 = 61,600.50 : x
  2. Step 2: Convert to fraction form
    85,613.76/128,474.10 = 61,600.50/x
  3. Step 3: Cross multiply
    85,613.76x = 128,474.10 × 61,600.50
  4. Step 4: Simplify right side
    85,613.76x = 7,914,068,797.05
  5. Step 5: Solve for x
    x = 7,914,068,797.05/85,613.76
  6. Step 6: Final answer
    x = 92,439.22

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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.