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Finding the Fourth Proportional to 86,121.68, 118,842 and 48,401.60

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Solution

The fourth proportional to 86,121.68, 118,842 and 48,401.60 is: 66,790.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,121.68 : 118,842 = 48,401.60 : x
  2. Step 2: Convert to fraction form
    86,121.68/118,842 = 48,401.60/x
  3. Step 3: Cross multiply
    86,121.68x = 118,842 × 48,401.60
  4. Step 4: Simplify right side
    86,121.68x = 5,752,142,947.20
  5. Step 5: Solve for x
    x = 5,752,142,947.20/86,121.68
  6. Step 6: Final answer
    x = 66,790.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.