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Finding the Fourth Proportional to 57,917.60, 86,876.40 and 43,920.80

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Solution

The fourth proportional to 57,917.60, 86,876.40 and 43,920.80 is: 65,881.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,917.60 : 86,876.40 = 43,920.80 : x
  2. Step 2: Convert to fraction form
    57,917.60/86,876.40 = 43,920.80/x
  3. Step 3: Cross multiply
    57,917.60x = 86,876.40 × 43,920.80
  4. Step 4: Simplify right side
    57,917.60x = 3,815,680,989.12
  5. Step 5: Solve for x
    x = 3,815,680,989.12/57,917.60
  6. Step 6: Final answer
    x = 65,881.20

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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.