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Finding the Fourth Proportional to 86,278.62, 129,245.63 and 68,539.31

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Solution

The fourth proportional to 86,278.62, 129,245.63 and 68,539.31 is: 102,672.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,278.62 : 129,245.63 = 68,539.31 : x
  2. Step 2: Convert to fraction form
    86,278.62/129,245.63 = 68,539.31/x
  3. Step 3: Cross multiply
    86,278.62x = 129,245.63 × 68,539.31
  4. Step 4: Simplify right side
    86,278.62x = 8,858,406,523.47
  5. Step 5: Solve for x
    x = 8,858,406,523.47/86,278.62
  6. Step 6: Final answer
    x = 102,672.10

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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.