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Finding the Fourth Proportional to 769.64, 1,060.26 and 636

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Solution

The fourth proportional to 769.64, 1,060.26 and 636 is: 876.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.64 : 1,060.26 = 636 : x
  2. Step 2: Convert to fraction form
    769.64/1,060.26 = 636/x
  3. Step 3: Cross multiply
    769.64x = 1,060.26 × 636
  4. Step 4: Simplify right side
    769.64x = 674,325.36
  5. Step 5: Solve for x
    x = 674,325.36/769.64
  6. Step 6: Final answer
    x = 876.16

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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.