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Finding the Fourth Proportional to 940.10, 1,297.49 and 691.43

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Solution

The fourth proportional to 940.10, 1,297.49 and 691.43 is: 954.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.10 : 1,297.49 = 691.43 : x
  2. Step 2: Convert to fraction form
    940.10/1,297.49 = 691.43/x
  3. Step 3: Cross multiply
    940.10x = 1,297.49 × 691.43
  4. Step 4: Simplify right side
    940.10x = 897,113.57
  5. Step 5: Solve for x
    x = 897,113.57/940.10
  6. Step 6: Final answer
    x = 954.28

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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.