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Finding the Fourth Proportional to 81,965.80, 122,948.70 and 79,114.60

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Solution

The fourth proportional to 81,965.80, 122,948.70 and 79,114.60 is: 118,671.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,965.80 : 122,948.70 = 79,114.60 : x
  2. Step 2: Convert to fraction form
    81,965.80/122,948.70 = 79,114.60/x
  3. Step 3: Cross multiply
    81,965.80x = 122,948.70 × 79,114.60
  4. Step 4: Simplify right side
    81,965.80x = 9,727,037,221.02
  5. Step 5: Solve for x
    x = 9,727,037,221.02/81,965.80
  6. Step 6: Final answer
    x = 118,671.90

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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.