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Finding the Fourth Proportional to 774.85, 1,161.47 and 254.72

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Solution

The fourth proportional to 774.85, 1,161.47 and 254.72 is: 381.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.85 : 1,161.47 = 254.72 : x
  2. Step 2: Convert to fraction form
    774.85/1,161.47 = 254.72/x
  3. Step 3: Cross multiply
    774.85x = 1,161.47 × 254.72
  4. Step 4: Simplify right side
    774.85x = 295,849.64
  5. Step 5: Solve for x
    x = 295,849.64/774.85
  6. Step 6: Final answer
    x = 381.82

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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.