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Finding the Fourth Proportional to 86,586.40, 129,879.60 and 53,516.80

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Solution

The fourth proportional to 86,586.40, 129,879.60 and 53,516.80 is: 80,275.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,586.40 : 129,879.60 = 53,516.80 : x
  2. Step 2: Convert to fraction form
    86,586.40/129,879.60 = 53,516.80/x
  3. Step 3: Cross multiply
    86,586.40x = 129,879.60 × 53,516.80
  4. Step 4: Simplify right side
    86,586.40x = 6,950,740,577.28
  5. Step 5: Solve for x
    x = 6,950,740,577.28/86,586.40
  6. Step 6: Final answer
    x = 80,275.20

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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.