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Finding the Fourth Proportional to 771.75, 1,157.09 and 552.38

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Solution

The fourth proportional to 771.75, 1,157.09 and 552.38 is: 828.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.75 : 1,157.09 = 552.38 : x
  2. Step 2: Convert to fraction form
    771.75/1,157.09 = 552.38/x
  3. Step 3: Cross multiply
    771.75x = 1,157.09 × 552.38
  4. Step 4: Simplify right side
    771.75x = 639,144.83
  5. Step 5: Solve for x
    x = 639,144.83/771.75
  6. Step 6: Final answer
    x = 828.18

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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.