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Finding the Fourth Proportional to 775.89, 1,069.84 and 635.56

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Solution

The fourth proportional to 775.89, 1,069.84 and 635.56 is: 876.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.89 : 1,069.84 = 635.56 : x
  2. Step 2: Convert to fraction form
    775.89/1,069.84 = 635.56/x
  3. Step 3: Cross multiply
    775.89x = 1,069.84 × 635.56
  4. Step 4: Simplify right side
    775.89x = 679,945.63
  5. Step 5: Solve for x
    x = 679,945.63/775.89
  6. Step 6: Final answer
    x = 876.34

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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.