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Finding the Fourth Proportional to 775.67, 1,069.76 and 635.78

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Solution

The fourth proportional to 775.67, 1,069.76 and 635.78 is: 876.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.67 : 1,069.76 = 635.78 : x
  2. Step 2: Convert to fraction form
    775.67/1,069.76 = 635.78/x
  3. Step 3: Cross multiply
    775.67x = 1,069.76 × 635.78
  4. Step 4: Simplify right side
    775.67x = 680,123.49
  5. Step 5: Solve for x
    x = 680,123.49/775.67
  6. Step 6: Final answer
    x = 876.83

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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.