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Finding the Fourth Proportional to 86,769.40, 130,154.10 and 85,847.80

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Solution

The fourth proportional to 86,769.40, 130,154.10 and 85,847.80 is: 128,771.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,769.40 : 130,154.10 = 85,847.80 : x
  2. Step 2: Convert to fraction form
    86,769.40/130,154.10 = 85,847.80/x
  3. Step 3: Cross multiply
    86,769.40x = 130,154.10 × 85,847.80
  4. Step 4: Simplify right side
    86,769.40x = 11,173,443,145.98
  5. Step 5: Solve for x
    x = 11,173,443,145.98/86,769.40
  6. Step 6: Final answer
    x = 128,771.70

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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.