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Finding the Fourth Proportional to 85,300.80, 127,720.80 and 66,868.80

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Solution

The fourth proportional to 85,300.80, 127,720.80 and 66,868.80 is: 100,122.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,300.80 : 127,720.80 = 66,868.80 : x
  2. Step 2: Convert to fraction form
    85,300.80/127,720.80 = 66,868.80/x
  3. Step 3: Cross multiply
    85,300.80x = 127,720.80 × 66,868.80
  4. Step 4: Simplify right side
    85,300.80x = 8,540,536,631.04
  5. Step 5: Solve for x
    x = 8,540,536,631.04/85,300.80
  6. Step 6: Final answer
    x = 100,122.59

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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.