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Finding the Fourth Proportional to 1,242.21, 1,714.22 and 682.68

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Solution

The fourth proportional to 1,242.21, 1,714.22 and 682.68 is: 942.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.21 : 1,714.22 = 682.68 : x
  2. Step 2: Convert to fraction form
    1,242.21/1,714.22 = 682.68/x
  3. Step 3: Cross multiply
    1,242.21x = 1,714.22 × 682.68
  4. Step 4: Simplify right side
    1,242.21x = 1,170,259.33
  5. Step 5: Solve for x
    x = 1,170,259.33/1,242.21
  6. Step 6: Final answer
    x = 942.08

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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.