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Finding the Fourth Proportional to 86,805.60, 129,851.92 and 69,309.60

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Solution

The fourth proportional to 86,805.60, 129,851.92 and 69,309.60 is: 103,679.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,805.60 : 129,851.92 = 69,309.60 : x
  2. Step 2: Convert to fraction form
    86,805.60/129,851.92 = 69,309.60/x
  3. Step 3: Cross multiply
    86,805.60x = 129,851.92 × 69,309.60
  4. Step 4: Simplify right side
    86,805.60x = 8,999,984,634.43
  5. Step 5: Solve for x
    x = 8,999,984,634.43/86,805.60
  6. Step 6: Final answer
    x = 103,679.77

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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.