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Finding the Fourth Proportional to 774.39, 1,161.78 and 384.39

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Solution

The fourth proportional to 774.39, 1,161.78 and 384.39 is: 576.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.39 : 1,161.78 = 384.39 : x
  2. Step 2: Convert to fraction form
    774.39/1,161.78 = 384.39/x
  3. Step 3: Cross multiply
    774.39x = 1,161.78 × 384.39
  4. Step 4: Simplify right side
    774.39x = 446,576.61
  5. Step 5: Solve for x
    x = 446,576.61/774.39
  6. Step 6: Final answer
    x = 576.68

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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.