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Finding the Fourth Proportional to 775.65, 1,163.76 and 385.64

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Solution

The fourth proportional to 775.65, 1,163.76 and 385.64 is: 578.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.65 : 1,163.76 = 385.64 : x
  2. Step 2: Convert to fraction form
    775.65/1,163.76 = 385.64/x
  3. Step 3: Cross multiply
    775.65x = 1,163.76 × 385.64
  4. Step 4: Simplify right side
    775.65x = 448,792.41
  5. Step 5: Solve for x
    x = 448,792.41/775.65
  6. Step 6: Final answer
    x = 578.60

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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.