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Finding the Fourth Proportional to 776.36, 1,071.96 and 629.64

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Solution

The fourth proportional to 776.36, 1,071.96 and 629.64 is: 869.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.36 : 1,071.96 = 629.64 : x
  2. Step 2: Convert to fraction form
    776.36/1,071.96 = 629.64/x
  3. Step 3: Cross multiply
    776.36x = 1,071.96 × 629.64
  4. Step 4: Simplify right side
    776.36x = 674,948.89
  5. Step 5: Solve for x
    x = 674,948.89/776.36
  6. Step 6: Final answer
    x = 869.38

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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.