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Finding the Fourth Proportional to 774.72, 1,161.18 and 428.27

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Solution

The fourth proportional to 774.72, 1,161.18 and 428.27 is: 641.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.72 : 1,161.18 = 428.27 : x
  2. Step 2: Convert to fraction form
    774.72/1,161.18 = 428.27/x
  3. Step 3: Cross multiply
    774.72x = 1,161.18 × 428.27
  4. Step 4: Simplify right side
    774.72x = 497,292.75
  5. Step 5: Solve for x
    x = 497,292.75/774.72
  6. Step 6: Final answer
    x = 641.90

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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.