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Finding the Fourth Proportional to 1,397.57, 1,923.81 and 1,208.43

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Solution

The fourth proportional to 1,397.57, 1,923.81 and 1,208.43 is: 1,663.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397.57 : 1,923.81 = 1,208.43 : x
  2. Step 2: Convert to fraction form
    1,397.57/1,923.81 = 1,208.43/x
  3. Step 3: Cross multiply
    1,397.57x = 1,923.81 × 1,208.43
  4. Step 4: Simplify right side
    1,397.57x = 2,324,785.19
  5. Step 5: Solve for x
    x = 2,324,785.19/1,397.57
  6. Step 6: Final answer
    x = 1,663.45

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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.