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Finding the Fourth Proportional to 86,706.64, 119,619.75 and 68,729.50

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Solution

The fourth proportional to 86,706.64, 119,619.75 and 68,729.50 is: 94,818.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,706.64 : 119,619.75 = 68,729.50 : x
  2. Step 2: Convert to fraction form
    86,706.64/119,619.75 = 68,729.50/x
  3. Step 3: Cross multiply
    86,706.64x = 119,619.75 × 68,729.50
  4. Step 4: Simplify right side
    86,706.64x = 8,221,405,607.63
  5. Step 5: Solve for x
    x = 8,221,405,607.63/86,706.64
  6. Step 6: Final answer
    x = 94,818.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.