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Finding the Fourth Proportional to 1,242, 1,714.32 and 828

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Solution

The fourth proportional to 1,242, 1,714.32 and 828 is: 1,142.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242 : 1,714.32 = 828 : x
  2. Step 2: Convert to fraction form
    1,242/1,714.32 = 828/x
  3. Step 3: Cross multiply
    1,242x = 1,714.32 × 828
  4. Step 4: Simplify right side
    1,242x = 1,419,456.96
  5. Step 5: Solve for x
    x = 1,419,456.96/1,242
  6. Step 6: Final answer
    x = 1,142.88

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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.