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Finding the Fourth Proportional to 86,716.90, 121,666.10 and 86,716.90

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Solution

The fourth proportional to 86,716.90, 121,666.10 and 86,716.90 is: 121,666.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,716.90 : 121,666.10 = 86,716.90 : x
  2. Step 2: Convert to fraction form
    86,716.90/121,666.10 = 86,716.90/x
  3. Step 3: Cross multiply
    86,716.90x = 121,666.10 × 86,716.90
  4. Step 4: Simplify right side
    86,716.90x = 10,550,507,027.09
  5. Step 5: Solve for x
    x = 10,550,507,027.09/86,716.90
  6. Step 6: Final answer
    x = 121,666.10

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.