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Finding the Fourth Proportional to 1,403.91, 1,938.21 and 931.68

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Solution

The fourth proportional to 1,403.91, 1,938.21 and 931.68 is: 1,286.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,403.91 : 1,938.21 = 931.68 : x
  2. Step 2: Convert to fraction form
    1,403.91/1,938.21 = 931.68/x
  3. Step 3: Cross multiply
    1,403.91x = 1,938.21 × 931.68
  4. Step 4: Simplify right side
    1,403.91x = 1,805,791.49
  5. Step 5: Solve for x
    x = 1,805,791.49/1,403.91
  6. Step 6: Final answer
    x = 1,286.26

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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.