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Finding the Fourth Proportional to 775.49, 1,163.30 and 385.59

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Solution

The fourth proportional to 775.49, 1,163.30 and 385.59 is: 578.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.49 : 1,163.30 = 385.59 : x
  2. Step 2: Convert to fraction form
    775.49/1,163.30 = 385.59/x
  3. Step 3: Cross multiply
    775.49x = 1,163.30 × 385.59
  4. Step 4: Simplify right side
    775.49x = 448,554.92
  5. Step 5: Solve for x
    x = 448,554.92/775.49
  6. Step 6: Final answer
    x = 578.41

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Double scale
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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.