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Finding the Fourth Proportional to 775.56, 1,069.34 and 617.70

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Solution

The fourth proportional to 775.56, 1,069.34 and 617.70 is: 851.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.56 : 1,069.34 = 617.70 : x
  2. Step 2: Convert to fraction form
    775.56/1,069.34 = 617.70/x
  3. Step 3: Cross multiply
    775.56x = 1,069.34 × 617.70
  4. Step 4: Simplify right side
    775.56x = 660,531.32
  5. Step 5: Solve for x
    x = 660,531.32/775.56
  6. Step 6: Final answer
    x = 851.68

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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.