Home / 81,147.20-121,720.80-53,153.60

Finding the Fourth Proportional to 81,147.20, 121,720.80 and 53,153.60

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Solution

The fourth proportional to 81,147.20, 121,720.80 and 53,153.60 is: 79,730.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,147.20 : 121,720.80 = 53,153.60 : x
  2. Step 2: Convert to fraction form
    81,147.20/121,720.80 = 53,153.60/x
  3. Step 3: Cross multiply
    81,147.20x = 121,720.80 × 53,153.60
  4. Step 4: Simplify right side
    81,147.20x = 6,469,898,714.88
  5. Step 5: Solve for x
    x = 6,469,898,714.88/81,147.20
  6. Step 6: Final answer
    x = 79,730.40

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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.