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Finding the Fourth Proportional to 80,961.60, 121,701.60 and 57,748.80

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Solution

The fourth proportional to 80,961.60, 121,701.60 and 57,748.80 is: 86,808.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,961.60 : 121,701.60 = 57,748.80 : x
  2. Step 2: Convert to fraction form
    80,961.60/121,701.60 = 57,748.80/x
  3. Step 3: Cross multiply
    80,961.60x = 121,701.60 × 57,748.80
  4. Step 4: Simplify right side
    80,961.60x = 7,028,121,358.08
  5. Step 5: Solve for x
    x = 7,028,121,358.08/80,961.60
  6. Step 6: Final answer
    x = 86,808.08

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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.