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Finding the Fourth Proportional to 774.62, 1,162.41 and 771.78

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Solution

The fourth proportional to 774.62, 1,162.41 and 771.78 is: 1,158.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.62 : 1,162.41 = 771.78 : x
  2. Step 2: Convert to fraction form
    774.62/1,162.41 = 771.78/x
  3. Step 3: Cross multiply
    774.62x = 1,162.41 × 771.78
  4. Step 4: Simplify right side
    774.62x = 897,127.70
  5. Step 5: Solve for x
    x = 897,127.70/774.62
  6. Step 6: Final answer
    x = 1,158.16

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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.