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Finding the Fourth Proportional to 775.87, 1,164.18 and 385.84

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Solution

The fourth proportional to 775.87, 1,164.18 and 385.84 is: 578.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.87 : 1,164.18 = 385.84 : x
  2. Step 2: Convert to fraction form
    775.87/1,164.18 = 385.84/x
  3. Step 3: Cross multiply
    775.87x = 1,164.18 × 385.84
  4. Step 4: Simplify right side
    775.87x = 449,187.21
  5. Step 5: Solve for x
    x = 449,187.21/775.87
  6. Step 6: Final answer
    x = 578.95

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1.5x scale

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.