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Finding the Fourth Proportional to 86,645.25, 129,968.42 and 31,241.25

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Solution

The fourth proportional to 86,645.25, 129,968.42 and 31,241.25 is: 46,862.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,645.25 : 129,968.42 = 31,241.25 : x
  2. Step 2: Convert to fraction form
    86,645.25/129,968.42 = 31,241.25/x
  3. Step 3: Cross multiply
    86,645.25x = 129,968.42 × 31,241.25
  4. Step 4: Simplify right side
    86,645.25x = 4,060,375,745.12
  5. Step 5: Solve for x
    x = 4,060,375,745.12/86,645.25
  6. Step 6: Final answer
    x = 46,862.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.