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Finding the Fourth Proportional to 81,948.60, 122,793.30 and 68,729.40

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Solution

The fourth proportional to 81,948.60, 122,793.30 and 68,729.40 is: 102,985.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,948.60 : 122,793.30 = 68,729.40 : x
  2. Step 2: Convert to fraction form
    81,948.60/122,793.30 = 68,729.40/x
  3. Step 3: Cross multiply
    81,948.60x = 122,793.30 × 68,729.40
  4. Step 4: Simplify right side
    81,948.60x = 8,439,509,833.02
  5. Step 5: Solve for x
    x = 8,439,509,833.02/81,948.60
  6. Step 6: Final answer
    x = 102,985.41

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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.