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Finding the Fourth Proportional to 86,918.60, 121,861 and 86,918.60

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Solution

The fourth proportional to 86,918.60, 121,861 and 86,918.60 is: 121,861

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,918.60 : 121,861 = 86,918.60 : x
  2. Step 2: Convert to fraction form
    86,918.60/121,861 = 86,918.60/x
  3. Step 3: Cross multiply
    86,918.60x = 121,861 × 86,918.60
  4. Step 4: Simplify right side
    86,918.60x = 10,591,987,514.60
  5. Step 5: Solve for x
    x = 10,591,987,514.60/86,918.60
  6. Step 6: Final answer
    x = 121,861

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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.