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Finding the Fourth Proportional to 80,434.80, 120,749.40 and 79,851.60

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Solution

The fourth proportional to 80,434.80, 120,749.40 and 79,851.60 is: 119,873.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,434.80 : 120,749.40 = 79,851.60 : x
  2. Step 2: Convert to fraction form
    80,434.80/120,749.40 = 79,851.60/x
  3. Step 3: Cross multiply
    80,434.80x = 120,749.40 × 79,851.60
  4. Step 4: Simplify right side
    80,434.80x = 9,642,032,789.04
  5. Step 5: Solve for x
    x = 9,642,032,789.04/80,434.80
  6. Step 6: Final answer
    x = 119,873.90

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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.