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Finding the Fourth Proportional to 1,242.20, 1,714.23 and 682.66

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Solution

The fourth proportional to 1,242.20, 1,714.23 and 682.66 is: 942.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.20 : 1,714.23 = 682.66 : x
  2. Step 2: Convert to fraction form
    1,242.20/1,714.23 = 682.66/x
  3. Step 3: Cross multiply
    1,242.20x = 1,714.23 × 682.66
  4. Step 4: Simplify right side
    1,242.20x = 1,170,233.57
  5. Step 5: Solve for x
    x = 1,170,233.57/1,242.20
  6. Step 6: Final answer
    x = 942.06

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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.