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Finding the Fourth Proportional to 771.72, 1,160.82 and 664.80

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Solution

The fourth proportional to 771.72, 1,160.82 and 664.80 is: 999.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.72 : 1,160.82 = 664.80 : x
  2. Step 2: Convert to fraction form
    771.72/1,160.82 = 664.80/x
  3. Step 3: Cross multiply
    771.72x = 1,160.82 × 664.80
  4. Step 4: Simplify right side
    771.72x = 771,713.14
  5. Step 5: Solve for x
    x = 771,713.14/771.72
  6. Step 6: Final answer
    x = 999.99

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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.