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Finding the Fourth Proportional to 83,911.20, 125,866.80 and 79,828.80

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Solution

The fourth proportional to 83,911.20, 125,866.80 and 79,828.80 is: 119,743.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,911.20 : 125,866.80 = 79,828.80 : x
  2. Step 2: Convert to fraction form
    83,911.20/125,866.80 = 79,828.80/x
  3. Step 3: Cross multiply
    83,911.20x = 125,866.80 × 79,828.80
  4. Step 4: Simplify right side
    83,911.20x = 10,047,795,603.84
  5. Step 5: Solve for x
    x = 10,047,795,603.84/83,911.20
  6. Step 6: Final answer
    x = 119,743.20

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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.