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Finding the Fourth Proportional to 86,679.90, 121,614.30 and 86,679.90

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Solution

The fourth proportional to 86,679.90, 121,614.30 and 86,679.90 is: 121,614.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,679.90 : 121,614.30 = 86,679.90 : x
  2. Step 2: Convert to fraction form
    86,679.90/121,614.30 = 86,679.90/x
  3. Step 3: Cross multiply
    86,679.90x = 121,614.30 × 86,679.90
  4. Step 4: Simplify right side
    86,679.90x = 10,541,515,362.57
  5. Step 5: Solve for x
    x = 10,541,515,362.57/86,679.90
  6. Step 6: Final answer
    x = 121,614.30

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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.