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Finding the Fourth Proportional to 80,768.75, 121,143.90 and 21,608.98

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Solution

The fourth proportional to 80,768.75, 121,143.90 and 21,608.98 is: 32,411.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,768.75 : 121,143.90 = 21,608.98 : x
  2. Step 2: Convert to fraction form
    80,768.75/121,143.90 = 21,608.98/x
  3. Step 3: Cross multiply
    80,768.75x = 121,143.90 × 21,608.98
  4. Step 4: Simplify right side
    80,768.75x = 2,617,795,890.40
  5. Step 5: Solve for x
    x = 2,617,795,890.40/80,768.75
  6. Step 6: Final answer
    x = 32,411.00

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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.