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Finding the Fourth Proportional to 86,657.80, 129,986.70 and 81,846.40

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Solution

The fourth proportional to 86,657.80, 129,986.70 and 81,846.40 is: 122,769.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,657.80 : 129,986.70 = 81,846.40 : x
  2. Step 2: Convert to fraction form
    86,657.80/129,986.70 = 81,846.40/x
  3. Step 3: Cross multiply
    86,657.80x = 129,986.70 × 81,846.40
  4. Step 4: Simplify right side
    86,657.80x = 10,638,943,442.88
  5. Step 5: Solve for x
    x = 10,638,943,442.88/86,657.80
  6. Step 6: Final answer
    x = 122,769.60

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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.