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Finding the Fourth Proportional to 1,243.78, 1,716.43 and 684.30

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Solution

The fourth proportional to 1,243.78, 1,716.43 and 684.30 is: 944.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.78 : 1,716.43 = 684.30 : x
  2. Step 2: Convert to fraction form
    1,243.78/1,716.43 = 684.30/x
  3. Step 3: Cross multiply
    1,243.78x = 1,716.43 × 684.30
  4. Step 4: Simplify right side
    1,243.78x = 1,174,553.05
  5. Step 5: Solve for x
    x = 1,174,553.05/1,243.78
  6. Step 6: Final answer
    x = 944.34

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1.5x scale

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.