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Finding the Fourth Proportional to 85,317.80, 127,976.70 and 80,709.80

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Solution

The fourth proportional to 85,317.80, 127,976.70 and 80,709.80 is: 121,064.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,317.80 : 127,976.70 = 80,709.80 : x
  2. Step 2: Convert to fraction form
    85,317.80/127,976.70 = 80,709.80/x
  3. Step 3: Cross multiply
    85,317.80x = 127,976.70 × 80,709.80
  4. Step 4: Simplify right side
    85,317.80x = 10,328,973,861.66
  5. Step 5: Solve for x
    x = 10,328,973,861.66/85,317.80
  6. Step 6: Final answer
    x = 121,064.70

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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.