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Finding the Fourth Proportional to 1,244.81, 1,717.83 and 685.31

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Solution

The fourth proportional to 1,244.81, 1,717.83 and 685.31 is: 945.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,244.81 : 1,717.83 = 685.31 : x
  2. Step 2: Convert to fraction form
    1,244.81/1,717.83 = 685.31/x
  3. Step 3: Cross multiply
    1,244.81x = 1,717.83 × 685.31
  4. Step 4: Simplify right side
    1,244.81x = 1,177,237.49
  5. Step 5: Solve for x
    x = 1,177,237.49/1,244.81
  6. Step 6: Final answer
    x = 945.72

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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.