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Finding the Fourth Proportional to 1,242, 1,713.69 and 718.02

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Solution

The fourth proportional to 1,242, 1,713.69 and 718.02 is: 990.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242 : 1,713.69 = 718.02 : x
  2. Step 2: Convert to fraction form
    1,242/1,713.69 = 718.02/x
  3. Step 3: Cross multiply
    1,242x = 1,713.69 × 718.02
  4. Step 4: Simplify right side
    1,242x = 1,230,463.69
  5. Step 5: Solve for x
    x = 1,230,463.69/1,242
  6. Step 6: Final answer
    x = 990.71

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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.