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Finding the Fourth Proportional to 881.69, 1,213.81 and 765.26

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Solution

The fourth proportional to 881.69, 1,213.81 and 765.26 is: 1,053.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.69 : 1,213.81 = 765.26 : x
  2. Step 2: Convert to fraction form
    881.69/1,213.81 = 765.26/x
  3. Step 3: Cross multiply
    881.69x = 1,213.81 × 765.26
  4. Step 4: Simplify right side
    881.69x = 928,872.26
  5. Step 5: Solve for x
    x = 928,872.26/881.69
  6. Step 6: Final answer
    x = 1,053.51

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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.