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Finding the Fourth Proportional to 1,242.73, 1,715 and 683.23

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Solution

The fourth proportional to 1,242.73, 1,715 and 683.23 is: 942.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.73 : 1,715 = 683.23 : x
  2. Step 2: Convert to fraction form
    1,242.73/1,715 = 683.23/x
  3. Step 3: Cross multiply
    1,242.73x = 1,715 × 683.23
  4. Step 4: Simplify right side
    1,242.73x = 1,171,739.45
  5. Step 5: Solve for x
    x = 1,171,739.45/1,242.73
  6. Step 6: Final answer
    x = 942.88

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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.