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Finding the Fourth Proportional to 775.21, 1,069.82 and 443.61

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Solution

The fourth proportional to 775.21, 1,069.82 and 443.61 is: 612.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.21 : 1,069.82 = 443.61 : x
  2. Step 2: Convert to fraction form
    775.21/1,069.82 = 443.61/x
  3. Step 3: Cross multiply
    775.21x = 1,069.82 × 443.61
  4. Step 4: Simplify right side
    775.21x = 474,580.63
  5. Step 5: Solve for x
    x = 474,580.63/775.21
  6. Step 6: Final answer
    x = 612.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.