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Finding the Fourth Proportional to 816.76, 1,231.26 and 762.45

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Solution

The fourth proportional to 816.76, 1,231.26 and 762.45 is: 1,149.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.76 : 1,231.26 = 762.45 : x
  2. Step 2: Convert to fraction form
    816.76/1,231.26 = 762.45/x
  3. Step 3: Cross multiply
    816.76x = 1,231.26 × 762.45
  4. Step 4: Simplify right side
    816.76x = 938,774.19
  5. Step 5: Solve for x
    x = 938,774.19/816.76
  6. Step 6: Final answer
    x = 1,149.39

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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.