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Finding the Fourth Proportional to 86,129.12, 128,699.58 and 65,753.13

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Solution

The fourth proportional to 86,129.12, 128,699.58 and 65,753.13 is: 98,252.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,129.12 : 128,699.58 = 65,753.13 : x
  2. Step 2: Convert to fraction form
    86,129.12/128,699.58 = 65,753.13/x
  3. Step 3: Cross multiply
    86,129.12x = 128,699.58 × 65,753.13
  4. Step 4: Simplify right side
    86,129.12x = 8,462,400,943.88
  5. Step 5: Solve for x
    x = 8,462,400,943.88/86,129.12
  6. Step 6: Final answer
    x = 98,252.49

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.