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Finding the Fourth Proportional to 81,081.60, 121,579.20 and 34,281.60

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Solution

The fourth proportional to 81,081.60, 121,579.20 and 34,281.60 is: 51,404.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,081.60 : 121,579.20 = 34,281.60 : x
  2. Step 2: Convert to fraction form
    81,081.60/121,579.20 = 34,281.60/x
  3. Step 3: Cross multiply
    81,081.60x = 121,579.20 × 34,281.60
  4. Step 4: Simplify right side
    81,081.60x = 4,167,929,502.72
  5. Step 5: Solve for x
    x = 4,167,929,502.72/81,081.60
  6. Step 6: Final answer
    x = 51,404.13

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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.