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Finding the Fourth Proportional to 86,065.69, 129,209.10 and 66,356.77

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Solution

The fourth proportional to 86,065.69, 129,209.10 and 66,356.77 is: 99,620.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,065.69 : 129,209.10 = 66,356.77 : x
  2. Step 2: Convert to fraction form
    86,065.69/129,209.10 = 66,356.77/x
  3. Step 3: Cross multiply
    86,065.69x = 129,209.10 × 66,356.77
  4. Step 4: Simplify right side
    86,065.69x = 8,573,898,530.61
  5. Step 5: Solve for x
    x = 8,573,898,530.61/86,065.69
  6. Step 6: Final answer
    x = 99,620.40

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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.