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Finding the Fourth Proportional to 776.21, 1,169.63 and 642.26

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Solution

The fourth proportional to 776.21, 1,169.63 and 642.26 is: 967.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.21 : 1,169.63 = 642.26 : x
  2. Step 2: Convert to fraction form
    776.21/1,169.63 = 642.26/x
  3. Step 3: Cross multiply
    776.21x = 1,169.63 × 642.26
  4. Step 4: Simplify right side
    776.21x = 751,197.50
  5. Step 5: Solve for x
    x = 751,197.50/776.21
  6. Step 6: Final answer
    x = 967.78

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.