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Finding the Fourth Proportional to 775.90, 1,163.85 and 391.06

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Solution

The fourth proportional to 775.90, 1,163.85 and 391.06 is: 586.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.90 : 1,163.85 = 391.06 : x
  2. Step 2: Convert to fraction form
    775.90/1,163.85 = 391.06/x
  3. Step 3: Cross multiply
    775.90x = 1,163.85 × 391.06
  4. Step 4: Simplify right side
    775.90x = 455,135.18
  5. Step 5: Solve for x
    x = 455,135.18/775.90
  6. Step 6: Final answer
    x = 586.59

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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.