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Finding the Fourth Proportional to 86,629.80, 121,515 and 86,629.80

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Solution

The fourth proportional to 86,629.80, 121,515 and 86,629.80 is: 121,515

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,629.80 : 121,515 = 86,629.80 : x
  2. Step 2: Convert to fraction form
    86,629.80/121,515 = 86,629.80/x
  3. Step 3: Cross multiply
    86,629.80x = 121,515 × 86,629.80
  4. Step 4: Simplify right side
    86,629.80x = 10,526,820,147
  5. Step 5: Solve for x
    x = 10,526,820,147/86,629.80
  6. Step 6: Final answer
    x = 121,515

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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.