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Finding the Fourth Proportional to 876.82, 1,208.24 and 815.31

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Solution

The fourth proportional to 876.82, 1,208.24 and 815.31 is: 1,123.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.82 : 1,208.24 = 815.31 : x
  2. Step 2: Convert to fraction form
    876.82/1,208.24 = 815.31/x
  3. Step 3: Cross multiply
    876.82x = 1,208.24 × 815.31
  4. Step 4: Simplify right side
    876.82x = 985,090.15
  5. Step 5: Solve for x
    x = 985,090.15/876.82
  6. Step 6: Final answer
    x = 1,123.48

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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.