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Finding the Fourth Proportional to 1,242.26, 1,714.38 and 718.29

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Solution

The fourth proportional to 1,242.26, 1,714.38 and 718.29 is: 991.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.26 : 1,714.38 = 718.29 : x
  2. Step 2: Convert to fraction form
    1,242.26/1,714.38 = 718.29/x
  3. Step 3: Cross multiply
    1,242.26x = 1,714.38 × 718.29
  4. Step 4: Simplify right side
    1,242.26x = 1,231,422.01
  5. Step 5: Solve for x
    x = 1,231,422.01/1,242.26
  6. Step 6: Final answer
    x = 991.28

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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.