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Finding the Fourth Proportional to 776.34, 1,163.64 and 390.78

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Solution

The fourth proportional to 776.34, 1,163.64 and 390.78 is: 585.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.34 : 1,163.64 = 390.78 : x
  2. Step 2: Convert to fraction form
    776.34/1,163.64 = 390.78/x
  3. Step 3: Cross multiply
    776.34x = 1,163.64 × 390.78
  4. Step 4: Simplify right side
    776.34x = 454,727.24
  5. Step 5: Solve for x
    x = 454,727.24/776.34
  6. Step 6: Final answer
    x = 585.73

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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.