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Finding the Fourth Proportional to 775.27, 1,162.91 and 390.79

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Solution

The fourth proportional to 775.27, 1,162.91 and 390.79 is: 586.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.27 : 1,162.91 = 390.79 : x
  2. Step 2: Convert to fraction form
    775.27/1,162.91 = 390.79/x
  3. Step 3: Cross multiply
    775.27x = 1,162.91 × 390.79
  4. Step 4: Simplify right side
    775.27x = 454,453.60
  5. Step 5: Solve for x
    x = 454,453.60/775.27
  6. Step 6: Final answer
    x = 586.19

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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.