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Finding the Fourth Proportional to 81,808.40, 122,712.60 and 78,309.20

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Solution

The fourth proportional to 81,808.40, 122,712.60 and 78,309.20 is: 117,463.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,808.40 : 122,712.60 = 78,309.20 : x
  2. Step 2: Convert to fraction form
    81,808.40/122,712.60 = 78,309.20/x
  3. Step 3: Cross multiply
    81,808.40x = 122,712.60 × 78,309.20
  4. Step 4: Simplify right side
    81,808.40x = 9,609,525,535.92
  5. Step 5: Solve for x
    x = 9,609,525,535.92/81,808.40
  6. Step 6: Final answer
    x = 117,463.80

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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.