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Finding the Fourth Proportional to 1,242.23, 1,713.92 and 718.25

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Solution

The fourth proportional to 1,242.23, 1,713.92 and 718.25 is: 990.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.23 : 1,713.92 = 718.25 : x
  2. Step 2: Convert to fraction form
    1,242.23/1,713.92 = 718.25/x
  3. Step 3: Cross multiply
    1,242.23x = 1,713.92 × 718.25
  4. Step 4: Simplify right side
    1,242.23x = 1,231,010.88
  5. Step 5: Solve for x
    x = 1,231,010.88/1,242.23
  6. Step 6: Final answer
    x = 990.97

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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.