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Finding the Fourth Proportional to 86,481.60, 129,621.60 and 39,739.20

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Solution

The fourth proportional to 86,481.60, 129,621.60 and 39,739.20 is: 59,562.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,481.60 : 129,621.60 = 39,739.20 : x
  2. Step 2: Convert to fraction form
    86,481.60/129,621.60 = 39,739.20/x
  3. Step 3: Cross multiply
    86,481.60x = 129,621.60 × 39,739.20
  4. Step 4: Simplify right side
    86,481.60x = 5,151,058,686.72
  5. Step 5: Solve for x
    x = 5,151,058,686.72/86,481.60
  6. Step 6: Final answer
    x = 59,562.48

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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.