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Finding the Fourth Proportional to 81,323.70, 121,985.55 and 68,493.30

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Solution

The fourth proportional to 81,323.70, 121,985.55 and 68,493.30 is: 102,739.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,323.70 : 121,985.55 = 68,493.30 : x
  2. Step 2: Convert to fraction form
    81,323.70/121,985.55 = 68,493.30/x
  3. Step 3: Cross multiply
    81,323.70x = 121,985.55 × 68,493.30
  4. Step 4: Simplify right side
    81,323.70x = 8,355,192,871.82
  5. Step 5: Solve for x
    x = 8,355,192,871.82/81,323.70
  6. Step 6: Final answer
    x = 102,739.95

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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.