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Finding the Fourth Proportional to 776.70, 1,164.62 and 385.90

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Solution

The fourth proportional to 776.70, 1,164.62 and 385.90 is: 578.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.70 : 1,164.62 = 385.90 : x
  2. Step 2: Convert to fraction form
    776.70/1,164.62 = 385.90/x
  3. Step 3: Cross multiply
    776.70x = 1,164.62 × 385.90
  4. Step 4: Simplify right side
    776.70x = 449,424.91
  5. Step 5: Solve for x
    x = 449,424.91/776.70
  6. Step 6: Final answer
    x = 578.63

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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.